2620643256 has 192 divisors, whose sum is σ = 9055537920. Its totient is φ = 664796160.

The previous prime is 2620643237. The next prime is 2620643257. The reversal of 2620643256 is 6523460262.

2620643256 is a `hidden beast` number, since 2 + 6 + 2 + 0 + 643 + 2 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2620643256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620643257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 232896 + ... + 243888.

It is an arithmetic number, because the mean of its divisors is an integer number (47164260).

Almost surely, 2^2620643256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2620643256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4527768960).

2620643256 is an abundant number, since it is smaller than the sum of its proper divisors (6434894664).

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

2620643256 is a wasteful number, since it uses less digits than its factorization.

2620643256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11066 (or 11059 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 2620643256 is about 51192.2187055806. The cubic root of 2620643256 is about 1378.6984956596.

The spelling of 2620643256 in words is "two billion, six hundred twenty million, six hundred forty-three thousand, two hundred fifty-six".