77929816 has 8 divisors (see below), whose sum is σ = 146118420. Its totient is φ = 38964904.

The previous prime is 77929759. The next prime is 77929823. The reversal of 77929816 is 61892977.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 77929816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4870606 + ... + 4870621.

Almost surely, 2^77929816 is an apocalyptic number.

It is an amenable number.

77929816 is a deficient number, since it is larger than the sum of its proper divisors (68188604).

77929816 is a wasteful number, since it uses less digits than its factorization.

77929816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9741233 (or 9741229 counting only the distinct ones).

The product of its digits is 381024, while the sum is 49.

The square root of 77929816 is about 8827.7865855491. The cubic root of 77929816 is about 427.1376791685.

The spelling of 77929816 in words is "seventy-seven million, nine hundred twenty-nine thousand, eight hundred sixteen".