77396172 has 96 divisors (see below), whose sum is σ = 221501952. Its totient is φ = 20530176.

The previous prime is 77396171. The next prime is 77396183. The reversal of 77396172 is 27169377.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (77396171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118198 + ... + 118850.

It is an arithmetic number, because the mean of its divisors is an integer number (2307312).

Almost surely, 2^77396172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77396172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110750976).

77396172 is an abundant number, since it is smaller than the sum of its proper divisors (144105780).

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

77396172 is a wasteful number, since it uses less digits than its factorization.

With its successor (77396173) it forms an eRAP, since the sums of their prime factors are consecutive (767 and 768).

77396172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767 (or 765 counting only the distinct ones).

The product of its digits is 111132, while the sum is 42.

The square root of 77396172 is about 8797.5094202848. The cubic root of 77396172 is about 426.1604676606.

The spelling of 77396172 in words is "seventy-seven million, three hundred ninety-six thousand, one hundred seventy-two".