77951992 has 16 divisors (see below), whose sum is σ = 146361600. Its totient is φ = 38922240.

The previous prime is 77951989. The next prime is 77951999. The reversal of 77951992 is 29915977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77951999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184 + ... + 12487.

It is an arithmetic number, because the mean of its divisors is an integer number (9147600).

Almost surely, 2^77951992 is an apocalyptic number.

It is an amenable number.

77951992 is a deficient number, since it is larger than the sum of its proper divisors (68409608).

77951992 is a wasteful number, since it uses less digits than its factorization.

77951992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13446 (or 13442 counting only the distinct ones).

The product of its digits is 357210, while the sum is 49.

The square root of 77951992 is about 8829.0425301954. The cubic root of 77951992 is about 427.1781912913.

The spelling of 77951992 in words is "seventy-seven million, nine hundred fifty-one thousand, nine hundred ninety-two".