2645520 has 80 divisors (see below), whose sum is σ = 8368512. Its totient is φ = 691200.

The previous prime is 2645519. The next prime is 2645521. The reversal of 2645520 is 255462.

It is an interprime number because it is at equal distance from previous prime (2645519) and next prime (2645521).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (2645521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17445 + ... + 17595.

2^2645520 is an apocalyptic number.

2645520 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 2645520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4184256).

2645520 is an abundant number, since it is smaller than the sum of its proper divisors (5722992).

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

2645520 is a wasteful number, since it uses less digits than its factorization.

2645520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 2645520 is about 1626.5054564925. The cubic root of 2645520 is about 138.3047246527.

The spelling of 2645520 in words is "two million, six hundred forty-five thousand, five hundred twenty".