2645720 has 64 divisors (see below), whose sum is σ = 7430400. Its totient is φ = 823680.

The previous prime is 2645717. The next prime is 2645723. The reversal of 2645720 is 275462.

2645720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2645717) and next prime (2645723).

It is a self number, because there is not a number n which added to its sum of digits gives 2645720.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2651 + ... + 3509.

It is an arithmetic number, because the mean of its divisors is an integer number (116100).

2^2645720 is an apocalyptic number.

2645720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2645720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3715200).

2645720 is an abundant number, since it is smaller than the sum of its proper divisors (4784680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2645720 is a wasteful number, since it uses less digits than its factorization.

2645720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 884 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 2645720 is about 1626.5669368335. The cubic root of 2645720 is about 138.3082098211.

It can be divided in two parts, 2645 and 720, that multiplied together give a square (1904400 = 1380²).

The spelling of 2645720 in words is "two million, six hundred forty-five thousand, seven hundred twenty".