77851868 has 12 divisors (see below), whose sum is σ = 136457160. Its totient is φ = 38864112.

The previous prime is 77851861. The next prime is 77851871. The reversal of 77851868 is 86815877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77851861) 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, 12563 + ... + 17706.

It is an arithmetic number, because the mean of its divisors is an integer number (11371430).

Almost surely, 2^77851868 is an apocalyptic number.

It is an amenable number.

77851868 is a deficient number, since it is larger than the sum of its proper divisors (58605292).

77851868 is a wasteful number, since it uses less digits than its factorization.

77851868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30916 (or 30914 counting only the distinct ones).

The product of its digits is 752640, while the sum is 50.

The square root of 77851868 is about 8823.3705577857. The cubic root of 77851868 is about 426.9952192113.

The spelling of 77851868 in words is "seventy-seven million, eight hundred fifty-one thousand, eight hundred sixty-eight".