77971152 has 60 divisors (see below), whose sum is σ = 234318336. Its totient is φ = 22276800.

The previous prime is 77971139. The next prime is 77971177. The reversal of 77971152 is 25117977.

It is a self number, because there is not a number n which added to its sum of digits gives 77971152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14224 + ... + 18927.

Almost surely, 2^77971152 is an apocalyptic number.

It is an amenable number.

77971152 is an abundant number, since it is smaller than the sum of its proper divisors (156347184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77971152 is a wasteful number, since it uses less digits than its factorization.

77971152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33176 (or 33163 counting only the distinct ones).

The product of its digits is 30870, while the sum is 39.

The square root of 77971152 is about 8830.1275188980. The cubic root of 77971152 is about 427.2131874620.

The spelling of 77971152 in words is "seventy-seven million, nine hundred seventy-one thousand, one hundred fifty-two".