76431720 has 32 divisors (see below), whose sum is σ = 229295520. Its totient is φ = 20381760.

The previous prime is 76431701. The next prime is 76431757. The reversal of 76431720 is 2713467.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318346 + ... + 318585.

It is an arithmetic number, because the mean of its divisors is an integer number (7165485).

Almost surely, 2^76431720 is an apocalyptic number.

It is an amenable number.

76431720 is an abundant number, since it is smaller than the sum of its proper divisors (152863800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

76431720 is a wasteful number, since it uses less digits than its factorization.

76431720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636945 (or 636941 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 76431720 is about 8742.5236631078. The cubic root of 76431720 is about 424.3829014097.

The spelling of 76431720 in words is "seventy-six million, four hundred thirty-one thousand, seven hundred twenty".