2643620 has 48 divisors (see below), whose sum is σ = 6628608. Its totient is φ = 865920.

The previous prime is 2643607. The next prime is 2643629. The reversal of 2643620 is 263462.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643629) 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, 2810 + ... + 3630.

It is an arithmetic number, because the mean of its divisors is an integer number (138096).

2^2643620 is an apocalyptic number.

2643620 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 2643620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3314304).

2643620 is an abundant number, since it is smaller than the sum of its proper divisors (3984988).

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

2643620 is a wasteful number, since it uses less digits than its factorization.

2643620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 2643620 is about 1625.9212773071. The cubic root of 2643620 is about 138.2716067892.

The spelling of 2643620 in words is "two million, six hundred forty-three thousand, six hundred twenty".