77857972 has 24 divisors (see below), whose sum is σ = 143780000. Its totient is φ = 36788256.

The previous prime is 77857951. The next prime is 77857973. The reversal of 77857972 is 27975877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77857973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36898 + ... + 38950.

Almost surely, 2^77857972 is an apocalyptic number.

It is an amenable number.

77857972 is a deficient number, since it is larger than the sum of its proper divisors (65922028).

77857972 is a wasteful number, since it uses less digits than its factorization.

77857972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575 (or 2573 counting only the distinct ones).

The product of its digits is 1728720, while the sum is 52.

The square root of 77857972 is about 8823.7164505666. The cubic root of 77857972 is about 427.0063784841.

The spelling of 77857972 in words is "seventy-seven million, eight hundred fifty-seven thousand, nine hundred seventy-two".