77917231 has 8 divisors (see below), whose sum is σ = 89137440. Its totient is φ = 66719328.

The previous prime is 77917219. The next prime is 77917237. The reversal of 77917231 is 13271977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77917231 is a prime.

It is a super-2 number, since 2×77917231² = 12142189773414722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77917237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2745 + ... + 12781.

It is an arithmetic number, because the mean of its divisors is an integer number (11142180).

Almost surely, 2^77917231 is an apocalyptic number.

77917231 is a deficient number, since it is larger than the sum of its proper divisors (11220209).

77917231 is a wasteful number, since it uses less digits than its factorization.

77917231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11153.

The product of its digits is 18522, while the sum is 37.

The square root of 77917231 is about 8827.0737506832. The cubic root of 77917231 is about 427.1146849011.

The spelling of 77917231 in words is "seventy-seven million, nine hundred seventeen thousand, two hundred thirty-one".