814561812 has 48 divisors (see below), whose sum is σ = 2117976000. Its totient is φ = 270730080.

The previous prime is 814561807. The next prime is 814561843. The reversal of 814561812 is 218165418.

814561812 is a `hidden beast` number, since 8 + 14 + 561 + 81 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between even and odd.

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, 26887 + ... + 48497.

It is an arithmetic number, because the mean of its divisors is an integer number (44124500).

Almost surely, 2^814561812 is an apocalyptic number.

It is an amenable number.

814561812 is an abundant number, since it is smaller than the sum of its proper divisors (1303414188).

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

814561812 is a wasteful number, since it uses less digits than its factorization.

814561812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21973 (or 21965 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 814561812 is about 28540.5292873135. The cubic root of 814561812 is about 933.9164287787.

The spelling of 814561812 in words is "eight hundred fourteen million, five hundred sixty-one thousand, eight hundred twelve".