776139972 has 48 divisors (see below), whose sum is σ = 1882437312. Its totient is φ = 248676480.

The previous prime is 776139961. The next prime is 776139983. The reversal of 776139972 is 279931677.

It is an interprime number because it is at equal distance from previous prime (776139961) and next prime (776139983).

It is a super-2 number, since 2×776139972² = 1204786512272321568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26322 + ... + 47382.

It is an arithmetic number, because the mean of its divisors is an integer number (39217444).

Almost surely, 2^776139972 is an apocalyptic number.

It is an amenable number.

776139972 is an abundant number, since it is smaller than the sum of its proper divisors (1106297340).

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

776139972 is a wasteful number, since it uses less digits than its factorization.

776139972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21188 (or 21186 counting only the distinct ones).

The product of its digits is 1000188, while the sum is 51.

The square root of 776139972 is about 27859.2887920708. The cubic root of 776139972 is about 918.9954267927.

The spelling of 776139972 in words is "seven hundred seventy-six million, one hundred thirty-nine thousand, nine hundred seventy-two".