71630920 has 32 divisors (see below), whose sum is σ = 161635320. Its totient is φ = 28569600.

The previous prime is 71630891. The next prime is 71630941. The reversal of 71630920 is 2903617.

It can be written as a sum of positive squares in 4 ways, for example, as 60621796 + 11009124 = 7786^2 + 3318^2 .

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, 12520 + ... + 17320.

Almost surely, 2^71630920 is an apocalyptic number.

It is an amenable number.

71630920 is an abundant number, since it is smaller than the sum of its proper divisors (90004400).

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

71630920 is a wasteful number, since it uses less digits than its factorization.

71630920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185 (or 5181 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 71630920 is about 8463.5051840239. The cubic root of 71630920 is about 415.3046971220.

The spelling of 71630920 in words is "seventy-one million, six hundred thirty thousand, nine hundred twenty".