2564688678 has 8 divisors (see below), whose sum is σ = 5129377368. Its totient is φ = 854896224.

The previous prime is 2564688649. The next prime is 2564688727. The reversal of 2564688678 is 8768864652.

It is a sphenic number, since it is the product of 3 distinct primes.

2564688678 is an admirable number.

It is a super-2 number, since 2×2564688678² = 13155256030122775368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213724051 + ... + 213724062.

It is an arithmetic number, because the mean of its divisors is an integer number (641172171).

Almost surely, 2^2564688678 is an apocalyptic number.

2564688678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2564688678 is a wasteful number, since it uses less digits than its factorization.

2564688678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427448118.

The product of its digits is 30965760, while the sum is 60.

The square root of 2564688678 is about 50642.7554345140. The cubic root of 2564688678 is about 1368.8154070118.

The spelling of 2564688678 in words is "two billion, five hundred sixty-four million, six hundred eighty-eight thousand, six hundred seventy-eight".