812823870 has 32 divisors (see below), whose sum is σ = 1951800480. Its totient is φ = 216639360.

The previous prime is 812823853. The next prime is 812823889. The reversal of 812823870 is 78328218.

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, 62100 + ... + 74040.

It is an arithmetic number, because the mean of its divisors is an integer number (60993765).

Almost surely, 2^812823870 is an apocalyptic number.

812823870 is an abundant number, since it is smaller than the sum of its proper divisors (1138976610).

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

812823870 is a wasteful number, since it uses less digits than its factorization.

812823870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14220.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 812823870 is about 28510.0661170752. The cubic root of 812823870 is about 933.2517571843.

The spelling of 812823870 in words is "eight hundred twelve million, eight hundred twenty-three thousand, eight hundred seventy".