811157620 has 48 divisors (see below), whose sum is σ = 2096535168. Its totient is φ = 256717440.

The previous prime is 811157609. The next prime is 811157663. The reversal of 811157620 is 26751118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221026 + ... + 224665.

It is an arithmetic number, because the mean of its divisors is an integer number (43677816).

Almost surely, 2^811157620 is an apocalyptic number.

It is an amenable number.

811157620 is an abundant number, since it is smaller than the sum of its proper divisors (1285377548).

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

811157620 is a wasteful number, since it uses less digits than its factorization.

811157620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445720 (or 445718 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 811157620 is about 28480.8289907439. The cubic root of 811157620 is about 932.6136137975.

The spelling of 811157620 in words is "eight hundred eleven million, one hundred fifty-seven thousand, six hundred twenty".