77289972 has 12 divisors (see below), whose sum is σ = 180343296. Its totient is φ = 25763320.

The previous prime is 77289911. The next prime is 77289983. The reversal of 77289972 is 27998277.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 3220404 + ... + 3220427.

It is an arithmetic number, because the mean of its divisors is an integer number (15028608).

Almost surely, 2^77289972 is an apocalyptic number.

It is an amenable number.

77289972 is an abundant number, since it is smaller than the sum of its proper divisors (103053324).

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

77289972 is a wasteful number, since it uses less digits than its factorization.

77289972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440838 (or 6440836 counting only the distinct ones).

The product of its digits is 889056, while the sum is 51.

The square root of 77289972 is about 8791.4715491776. The cubic root of 77289972 is about 425.9654581969.

The spelling of 77289972 in words is "seventy-seven million, two hundred eighty-nine thousand, nine hundred seventy-two".