77328431 has 4 divisors (see below), whose sum is σ = 78787512. Its totient is φ = 75869352.

The previous prime is 77328401. The next prime is 77328457. The reversal of 77328431 is 13482377.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77328431 is a prime.

It is a super-2 number, since 2×77328431² = 11959372481843522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77328391 and 77328400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77328401) 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, 729461 + ... + 729566.

It is an arithmetic number, because the mean of its divisors is an integer number (19696878).

Almost surely, 2^77328431 is an apocalyptic number.

77328431 is a deficient number, since it is larger than the sum of its proper divisors (1459081).

77328431 is a wasteful number, since it uses less digits than its factorization.

77328431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459080.

The product of its digits is 28224, while the sum is 35.

The square root of 77328431 is about 8793.6585673996. The cubic root of 77328431 is about 426.0360990517.

The spelling of 77328431 in words is "seventy-seven million, three hundred twenty-eight thousand, four hundred thirty-one".