813288040 has 32 divisors (see below), whose sum is σ = 1830735360. Its totient is φ = 325166400.

The previous prime is 813288029. The next prime is 813288043. The reversal of 813288040 is 40882318.

It is a super-2 number, since 2×813288040² = 1322874872014083200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813287987 and 813288005.

It is not an unprimeable number, because it can be changed into a prime (813288043) 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, 137545 + ... + 143335.

It is an arithmetic number, because the mean of its divisors is an integer number (57210480).

Almost surely, 2^813288040 is an apocalyptic number.

It is an amenable number.

813288040 is an abundant number, since it is smaller than the sum of its proper divisors (1017447320).

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

813288040 is a wasteful number, since it uses less digits than its factorization.

813288040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9313 (or 9309 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 813288040 is about 28518.2054133846. The cubic root of 813288040 is about 933.4293705032.

The spelling of 813288040 in words is "eight hundred thirteen million, two hundred eighty-eight thousand, forty".