77972552 has 16 divisors (see below), whose sum is σ = 167084160. Its totient is φ = 33416784.

The previous prime is 77972551. The next prime is 77972563. The reversal of 77972552 is 25527977.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (77972551) 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, 696128 + ... + 696239.

It is an arithmetic number, because the mean of its divisors is an integer number (10442760).

Almost surely, 2^77972552 is an apocalyptic number.

It is an amenable number.

77972552 is an abundant number, since it is smaller than the sum of its proper divisors (89111608).

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

77972552 is a wasteful number, since it uses less digits than its factorization.

77972552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392380 (or 1392376 counting only the distinct ones).

The product of its digits is 308700, while the sum is 44.

The square root of 77972552 is about 8830.2067925955. The cubic root of 77972552 is about 427.2157443687.

The spelling of 77972552 in words is "seventy-seven million, nine hundred seventy-two thousand, five hundred fifty-two".