2557864 has 8 divisors (see below), whose sum is σ = 4796010. Its totient is φ = 1278928.

The previous prime is 2557861. The next prime is 2557879. The reversal of 2557864 is 4687552.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1800964 + 756900 = 1342^2 + 870^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2557861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159859 + ... + 159874.

2^2557864 is an apocalyptic number.

It is an amenable number.

2557864 is a deficient number, since it is larger than the sum of its proper divisors (2238146).

2557864 is a wasteful number, since it uses less digits than its factorization.

2557864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319739 (or 319735 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 2557864 is about 1599.3323607056. The cubic root of 2557864 is about 136.7600181826.

The spelling of 2557864 in words is "two million, five hundred fifty-seven thousand, eight hundred sixty-four".