77791816 has 32 divisors (see below), whose sum is σ = 150796800. Its totient is φ = 37598400.

The previous prime is 77791811. The next prime is 77791829. The reversal of 77791816 is 61819777.

It is not an unprimeable number, because it can be changed into a prime (77791811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33625 + ... + 35863.

It is an arithmetic number, because the mean of its divisors is an integer number (4712400).

Almost surely, 2^77791816 is an apocalyptic number.

It is an amenable number.

77791816 is a deficient number, since it is larger than the sum of its proper divisors (73004984).

77791816 is a wasteful number, since it uses less digits than its factorization.

77791816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389 (or 2385 counting only the distinct ones).

The product of its digits is 148176, while the sum is 46.

The square root of 77791816 is about 8819.9668933619. The cubic root of 77791816 is about 426.8854016245.

The spelling of 77791816 in words is "seventy-seven million, seven hundred ninety-one thousand, eight hundred sixteen".