813438280 has 16 divisors (see below), whose sum is σ = 1830236220. Its totient is φ = 325375296.

The previous prime is 813438271. The next prime is 813438293. The reversal of 813438280 is 82834318.

It can be written as a sum of positive squares in 2 ways, for example, as 686335204 + 127103076 = 26198^2 + 11274^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10167939 + ... + 10168018.

Almost surely, 2^813438280 is an apocalyptic number.

It is an amenable number.

813438280 is an abundant number, since it is smaller than the sum of its proper divisors (1016797940).

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

813438280 is a wasteful number, since it uses less digits than its factorization.

813438280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20335968 (or 20335964 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 813438280 is about 28520.8393985871. The cubic root of 813438280 is about 933.4868449309.

The spelling of 813438280 in words is "eight hundred thirteen million, four hundred thirty-eight thousand, two hundred eighty".