2567855864 has 32 divisors (see below), whose sum is σ = 5580057600. Its totient is φ = 1085007840.

The previous prime is 2567855819. The next prime is 2567855881. The reversal of 2567855864 is 4685587652.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318944 + ... + 326895.

It is an arithmetic number, because the mean of its divisors is an integer number (174376800).

Almost surely, 2^2567855864 is an apocalyptic number.

It is an amenable number.

2567855864 is an abundant number, since it is smaller than the sum of its proper divisors (3012201736).

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

2567855864 is a wasteful number, since it uses less digits than its factorization.

2567855864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645923 (or 645919 counting only the distinct ones).

The product of its digits is 16128000, while the sum is 56.

The square root of 2567855864 is about 50674.0156687824. The cubic root of 2567855864 is about 1369.3786345195.

The spelling of 2567855864 in words is "two billion, five hundred sixty-seven million, eight hundred fifty-five thousand, eight hundred sixty-four".