3864778631 has 16 divisors (see below), whose sum is σ = 4499219520. Its totient is φ = 3251466240.

The previous prime is 3864778627. The next prime is 3864778661. The reversal of 3864778631 is 1368774683.

It is a cyclic number.

It is not a de Polignac number, because 3864778631 - 2² = 3864778627 is a prime.

It is a super-2 number, since 2×3864778631² = 29873027733268468322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3864778661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62711 + ... + 107991.

It is an arithmetic number, because the mean of its divisors is an integer number (281201220).

Almost surely, 2^3864778631 is an apocalyptic number.

3864778631 is a deficient number, since it is larger than the sum of its proper divisors (634440889).

3864778631 is a wasteful number, since it uses less digits than its factorization.

3864778631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45514.

The product of its digits is 4064256, while the sum is 53.

The square root of 3864778631 is about 62167.3437666433. The cubic root of 3864778631 is about 1569.3080687966.

The spelling of 3864778631 in words is "three billion, eight hundred sixty-four million, seven hundred seventy-eight thousand, six hundred thirty-one".