812562990 has 32 divisors (see below), whose sum is σ = 1958683680. Its totient is φ = 215735424.

The previous prime is 812562973. The next prime is 812562997. The reversal of 812562990 is 99265218.

It is a super-2 number, since 2×812562990² = 1320517225435480200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812562997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52269 + ... + 66008.

It is an arithmetic number, because the mean of its divisors is an integer number (61208865).

Almost surely, 2^812562990 is an apocalyptic number.

812562990 is an abundant number, since it is smaller than the sum of its proper divisors (1146120690).

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

812562990 is a wasteful number, since it uses less digits than its factorization.

812562990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118516.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 812562990 is about 28505.4905237570. The cubic root of 812562990 is about 933.1519025174.

The spelling of 812562990 in words is "eight hundred twelve million, five hundred sixty-two thousand, nine hundred ninety".