71315820 has 36 divisors (see below), whose sum is σ = 216325200. Its totient is φ = 19017504.

The previous prime is 71315819. The next prime is 71315831. The reversal of 71315820 is 2851317.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197920 + ... + 198279.

Almost surely, 2^71315820 is an apocalyptic number.

It is an amenable number.

71315820 is an abundant number, since it is smaller than the sum of its proper divisors (145009380).

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

71315820 is a wasteful number, since it uses less digits than its factorization.

71315820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396214 (or 396209 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 71315820 is about 8444.8694483692. The cubic root of 71315820 is about 414.6948354135.

The spelling of 71315820 in words is "seventy-one million, three hundred fifteen thousand, eight hundred twenty".