71979320 has 32 divisors (see below), whose sum is σ = 185090400. Its totient is φ = 24678528.

The previous prime is 71979311. The next prime is 71979331. The reversal of 71979320 is 2397917.

It is a congruent number.

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, 128255 + ... + 128814.

It is an arithmetic number, because the mean of its divisors is an integer number (5784075).

Almost surely, 2^71979320 is an apocalyptic number.

71979320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71979320 is an abundant number, since it is smaller than the sum of its proper divisors (113111080).

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

71979320 is a wasteful number, since it uses less digits than its factorization.

71979320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257087 (or 257083 counting only the distinct ones).

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 71979320 is about 8484.0627060389. The cubic root of 71979320 is about 415.9769310432.

The spelling of 71979320 in words is "seventy-one million, nine hundred seventy-nine thousand, three hundred twenty".