77986431 has 12 divisors (see below), whose sum is σ = 118576120. Its totient is φ = 49254480.

The previous prime is 77986427. The next prime is 77986439. The reversal of 77986431 is 13468977.

It is not a de Polignac number, because 77986431 - 2² = 77986427 is a prime.

It is a super-2 number, since 2×77986431² = 12163766840235522, 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 (77986439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227860 + ... + 228201.

Almost surely, 2^77986431 is an apocalyptic number.

77986431 is a deficient number, since it is larger than the sum of its proper divisors (40589689).

77986431 is a wasteful number, since it uses less digits than its factorization.

77986431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456086 (or 456083 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 77986431 is about 8830.9926395621. The cubic root of 77986431 is about 427.2410907904.

The spelling of 77986431 in words is "seventy-seven million, nine hundred eighty-six thousand, four hundred thirty-one".