71564490 has 24 divisors (see below), whose sum is σ = 186067908. Its totient is φ = 19083840.

The previous prime is 71564483. The next prime is 71564539. The reversal of 71564490 is 9446517.

71564490 is a `hidden beast` number, since 7 + 1 + 5 + 644 + 9 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70913241 + 651249 = 8421^2 + 807^2 .

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, 397491 + ... + 397670.

Almost surely, 2^71564490 is an apocalyptic number.

71564490 is an abundant number, since it is smaller than the sum of its proper divisors (114503418).

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

71564490 is a wasteful number, since it uses less digits than its factorization.

71564490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795174 (or 795171 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 71564490 is about 8459.5797767974. The cubic root of 71564490 is about 415.1762738845.

The spelling of 71564490 in words is "seventy-one million, five hundred sixty-four thousand, four hundred ninety".