77506431 has 8 divisors (see below), whose sum is σ = 105540864. Its totient is φ = 50571480.

The previous prime is 77506427. The next prime is 77506439. The reversal of 77506431 is 13460577.

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

It is not a de Polignac number, because 77506431 - 2² = 77506427 is a prime.

It is a super-2 number, since 2×77506431² = 12014493692715522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77506392 and 77506401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77506439) 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, 274705 + ... + 274986.

It is an arithmetic number, because the mean of its divisors is an integer number (13192608).

Almost surely, 2^77506431 is an apocalyptic number.

77506431 is a deficient number, since it is larger than the sum of its proper divisors (28034433).

77506431 is a wasteful number, since it uses less digits than its factorization.

77506431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549741.

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 77506431 is about 8803.7736795081. The cubic root of 77506431 is about 426.3627417968.

The spelling of 77506431 in words is "seventy-seven million, five hundred six thousand, four hundred thirty-one".