77745231 has 16 divisors (see below), whose sum is σ = 116239200. Its totient is φ = 51352704.

The previous prime is 77745229. The next prime is 77745257. The reversal of 77745231 is 13254777.

It is not a de Polignac number, because 77745231 - 2¹ = 77745229 is a prime.

It is a super-2 number, since 2×77745231² = 12088641886486722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77745211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10266 + ... + 16151.

It is an arithmetic number, because the mean of its divisors is an integer number (7264950).

Almost surely, 2^77745231 is an apocalyptic number.

77745231 is a deficient number, since it is larger than the sum of its proper divisors (38493969).

77745231 is a wasteful number, since it uses less digits than its factorization.

77745231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26535 (or 26529 counting only the distinct ones).

The product of its digits is 41160, while the sum is 36.

The square root of 77745231 is about 8817.3256149470. The cubic root of 77745231 is about 426.8001723190.

The spelling of 77745231 in words is "seventy-seven million, seven hundred forty-five thousand, two hundred thirty-one".