77913686 has 16 divisors (see below), whose sum is σ = 126380736. Its totient is φ = 35884416.

The previous prime is 77913679. The next prime is 77913707. The reversal of 77913686 is 68631977.

It is a super-2 number, since 2×77913686² = 12141084932213192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 77913686.

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, 22781 + ... + 25976.

It is an arithmetic number, because the mean of its divisors is an integer number (7898796).

Almost surely, 2^77913686 is an apocalyptic number.

77913686 is a deficient number, since it is larger than the sum of its proper divisors (48467050).

77913686 is a wasteful number, since it uses less digits than its factorization.

77913686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48823.

The product of its digits is 381024, while the sum is 47.

The square root of 77913686 is about 8826.8729457266. The cubic root of 77913686 is about 427.1082073244.

The spelling of 77913686 in words is "seventy-seven million, nine hundred thirteen thousand, six hundred eighty-six".