71971320 has 64 divisors (see below), whose sum is σ = 216548640. Its totient is φ = 19136000.

The previous prime is 71971307. The next prime is 71971331. The reversal of 71971320 is 2317917.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54670 + ... + 55970.

Almost surely, 2^71971320 is an apocalyptic number.

It is an amenable number.

71971320 is an abundant number, since it is smaller than the sum of its proper divisors (144577320).

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

71971320 is a wasteful number, since it uses less digits than its factorization.

71971320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776 (or 1772 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 71971320 is about 8483.5912207036. The cubic root of 71971320 is about 415.9615194929.

The spelling of 71971320 in words is "seventy-one million, nine hundred seventy-one thousand, three hundred twenty".