814651820 has 12 divisors (see below), whose sum is σ = 1710768864. Its totient is φ = 325860720.

The previous prime is 814651807. The next prime is 814651843. The reversal of 814651820 is 28156418.

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, 20366276 + ... + 20366315.

It is an arithmetic number, because the mean of its divisors is an integer number (142564072).

Almost surely, 2^814651820 is an apocalyptic number.

It is an amenable number.

814651820 is an abundant number, since it is smaller than the sum of its proper divisors (896117044).

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

814651820 is a wasteful number, since it uses less digits than its factorization.

814651820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40732600 (or 40732598 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 814651820 is about 28542.1060890748. The cubic root of 814651820 is about 933.9508263541.

The spelling of 814651820 in words is "eight hundred fourteen million, six hundred fifty-one thousand, eight hundred twenty".