77944231 has 4 divisors (see below), whose sum is σ = 77984712. Its totient is φ = 77903752.

The previous prime is 77944219. The next prime is 77944267. The reversal of 77944231 is 13244977.

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

It is a cyclic number.

It is not a de Polignac number, because 77944231 - 2⁷ = 77944103 is a prime.

It is a super-2 number, since 2×77944231² = 12150606292362722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77944271) 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, 17200 + ... + 21253.

It is an arithmetic number, because the mean of its divisors is an integer number (19496178).

Almost surely, 2^77944231 is an apocalyptic number.

77944231 is a deficient number, since it is larger than the sum of its proper divisors (40481).

77944231 is a wasteful number, since it uses less digits than its factorization.

77944231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40480.

The product of its digits is 42336, while the sum is 37.

The square root of 77944231 is about 8828.6030038733. The cubic root of 77944231 is about 427.1640140185.

The spelling of 77944231 in words is "seventy-seven million, nine hundred forty-four thousand, two hundred thirty-one".