77768072 has 16 divisors (see below), whose sum is σ = 146010060. Its totient is φ = 38832064.

The previous prime is 77768051. The next prime is 77768087. The reversal of 77768072 is 27086777.

It can be written as a sum of positive squares in 2 ways, for example, as 76983076 + 784996 = 8774^2 + 886^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278 + ... + 12474.

Almost surely, 2^77768072 is an apocalyptic number.

It is an amenable number.

77768072 is a deficient number, since it is larger than the sum of its proper divisors (68241988).

77768072 is a wasteful number, since it uses less digits than its factorization.

77768072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13000 (or 12996 counting only the distinct ones).

The product of its (nonzero) digits is 230496, while the sum is 44.

The square root of 77768072 is about 8818.6207538367. The cubic root of 77768072 is about 426.8419651856.

The spelling of 77768072 in words is "seventy-seven million, seven hundred sixty-eight thousand, seventy-two".