3867256557 has 24 divisors (see below), whose sum is σ = 5722924064. Its totient is φ = 2515139424.

The previous prime is 3867256531. The next prime is 3867256567. The reversal of 3867256557 is 7556527683.

3867256557 is a `hidden beast` number, since 3 + 8 + 6 + 72 + 565 + 5 + 7 = 666.

It is not a de Polignac number, because 3867256557 - 2⁸ = 3867256301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3867256567) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 336063 + ... + 347379.

Almost surely, 2^3867256557 is an apocalyptic number.

It is an amenable number.

3867256557 is a deficient number, since it is larger than the sum of its proper divisors (1855667507).

3867256557 is a wasteful number, since it uses less digits than its factorization.

3867256557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12249 (or 12246 counting only the distinct ones).

The product of its digits is 10584000, while the sum is 54.

The square root of 3867256557 is about 62187.2700558563. The cubic root of 3867256557 is about 1569.6433875699.

The spelling of 3867256557 in words is "three billion, eight hundred sixty-seven million, two hundred fifty-six thousand, five hundred fifty-seven".