2564771838 has 16 divisors (see below), whose sum is σ = 5131969680. Its totient is φ = 854519616.

The previous prime is 2564771801. The next prime is 2564771843. The reversal of 2564771838 is 8381774652.

It is a congruent number.

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, 87193 + ... + 112836.

It is an arithmetic number, because the mean of its divisors is an integer number (320748105).

Almost surely, 2^2564771838 is an apocalyptic number.

2564771838 is an abundant number, since it is smaller than the sum of its proper divisors (2567197842).

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

2564771838 is a wasteful number, since it uses less digits than its factorization.

2564771838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202171.

The product of its digits is 2257920, while the sum is 51.

The square root of 2564771838 is about 50643.5764732310. The cubic root of 2564771838 is about 1368.8302014597.

The spelling of 2564771838 in words is "two billion, five hundred sixty-four million, seven hundred seventy-one thousand, eight hundred thirty-eight".