813021632 has 28 divisors (see below), whose sum is σ = 1625672136. Its totient is φ = 403403520.

The previous prime is 813021623. The next prime is 813021637. The reversal of 813021632 is 236120318.

It is a super-2 number, since 2×813021632² = 1322008348199886848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813021637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40103 + ... + 56870.

Almost surely, 2^813021632 is an apocalyptic number.

It is an amenable number.

813021632 is a deficient number, since it is larger than the sum of its proper divisors (812650504).

813021632 is a wasteful number, since it uses less digits than its factorization.

813021632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97116 (or 97106 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 813021632 is about 28513.5341899246. The cubic root of 813021632 is about 933.3274385115.

The spelling of 813021632 in words is "eight hundred thirteen million, twenty-one thousand, six hundred thirty-two".