77961868 has 6 divisors (see below), whose sum is σ = 136433276. Its totient is φ = 38980932.

The previous prime is 77961859. The next prime is 77961893. The reversal of 77961868 is 86816977.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9745230 + ... + 9745237.

Almost surely, 2^77961868 is an apocalyptic number.

It is an amenable number.

77961868 is a deficient number, since it is larger than the sum of its proper divisors (58471408).

77961868 is a wasteful number, since it uses less digits than its factorization.

77961868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19490471 (or 19490469 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 52.

The square root of 77961868 is about 8829.6018030260. The cubic root of 77961868 is about 427.1962307433.

The spelling of 77961868 in words is "seventy-seven million, nine hundred sixty-one thousand, eight hundred sixty-eight".