2564678386 has 16 divisors (see below), whose sum is σ = 3880479744. Its totient is φ = 1271201904.

The previous prime is 2564678323. The next prime is 2564678393. The reversal of 2564678386 is 6838764652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375841 + ... + 382603.

It is an arithmetic number, because the mean of its divisors is an integer number (242529984).

Almost surely, 2^2564678386 is an apocalyptic number.

2564678386 is a deficient number, since it is larger than the sum of its proper divisors (1315801358).

2564678386 is a wasteful number, since it uses less digits than its factorization.

2564678386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8385.

The product of its digits is 11612160, while the sum is 55.

The square root of 2564678386 is about 50642.6538206678. The cubic root of 2564678386 is about 1368.8135760076.

The spelling of 2564678386 in words is "two billion, five hundred sixty-four million, six hundred seventy-eight thousand, three hundred eighty-six".