813788370 has 40 divisors (see below), whose sum is σ = 2188188684. Its totient is φ = 217010016.

The previous prime is 813788363. The next prime is 813788399. The reversal of 813788370 is 73887318.

It can be written as a sum of positive squares in 2 ways, for example, as 783944001 + 29844369 = 27999^2 + 5463^2 .

It is a super-3 number, since 3×813788370³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 501529 + ... + 503148.

Almost surely, 2^813788370 is an apocalyptic number.

813788370 is an abundant number, since it is smaller than the sum of its proper divisors (1374400314).

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

813788370 is a wasteful number, since it uses less digits than its factorization.

813788370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004696 (or 1004687 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 813788370 is about 28526.9761804507. The cubic root of 813788370 is about 933.6207446769.

The spelling of 813788370 in words is "eight hundred thirteen million, seven hundred eighty-eight thousand, three hundred seventy".