77172912 has 120 divisors (see below), whose sum is σ = 233985024. Its totient is φ = 24577344.

The previous prime is 77172883. The next prime is 77172913. The reversal of 77172912 is 21927177.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (77172913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88993 + ... + 89855.

Almost surely, 2^77172912 is an apocalyptic number.

77172912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77172912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116992512).

77172912 is an abundant number, since it is smaller than the sum of its proper divisors (156812112).

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

77172912 is a wasteful number, since it uses less digits than its factorization.

77172912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 891 counting only the distinct ones).

The product of its digits is 12348, while the sum is 36.

The square root of 77172912 is about 8784.8114379308. The cubic root of 77172912 is about 425.7503000069.

The spelling of 77172912 in words is "seventy-seven million, one hundred seventy-two thousand, nine hundred twelve".