813271564 has 24 divisors (see below), whose sum is σ = 1628379648. Its totient is φ = 348151440.

The previous prime is 813271561. The next prime is 813271567. The reversal of 813271564 is 465172318.

It is an interprime number because it is at equal distance from previous prime (813271561) and next prime (813271567).

It is a super-2 number, since 2×813271564² = 1322821273622012192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813271561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9567 + ... + 41449.

It is an arithmetic number, because the mean of its divisors is an integer number (67849152).

Almost surely, 2^813271564 is an apocalyptic number.

It is an amenable number.

813271564 is an abundant number, since it is smaller than the sum of its proper divisors (815108084).

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

813271564 is a wasteful number, since it uses less digits than its factorization.

813271564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32805 (or 32803 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 813271564 is about 28517.9165438150. The cubic root of 813271564 is about 933.4230671661.

The spelling of 813271564 in words is "eight hundred thirteen million, two hundred seventy-one thousand, five hundred sixty-four".