2556804642 has 32 divisors (see below), whose sum is σ = 5886182400. Its totient is φ = 725258448.

The previous prime is 2556804619. The next prime is 2556804647. The reversal of 2556804642 is 2464086552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 2556804594 and 2556804603.

It is not an unprimeable number, because it can be changed into a prime (2556804647) 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, 213142 + ... + 224817.

It is an arithmetic number, because the mean of its divisors is an integer number (183943200).

Almost surely, 2^2556804642 is an apocalyptic number.

2556804642 is an abundant number, since it is smaller than the sum of its proper divisors (3329377758).

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

2556804642 is a wasteful number, since it uses less digits than its factorization.

2556804642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438110.

The product of its (nonzero) digits is 460800, while the sum is 42.

The square root of 2556804642 is about 50564.8557992604. The cubic root of 2556804642 is about 1367.4113552313.

The spelling of 2556804642 in words is "two billion, five hundred fifty-six million, eight hundred four thousand, six hundred forty-two".