812476820 has 12 divisors (see below), whose sum is σ = 1706201364. Its totient is φ = 324990720.

The previous prime is 812476783. The next prime is 812476837. The reversal of 812476820 is 28674218.

It can be written as a sum of positive squares in 2 ways, for example, as 584285584 + 228191236 = 24172^2 + 15106^2 .

It is a congruent number.

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, 20311901 + ... + 20311940.

It is an arithmetic number, because the mean of its divisors is an integer number (142183447).

Almost surely, 2^812476820 is an apocalyptic number.

It is an amenable number.

812476820 is an abundant number, since it is smaller than the sum of its proper divisors (893724544).

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

812476820 is a wasteful number, since it uses less digits than its factorization.

812476820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40623850 (or 40623848 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 812476820 is about 28503.9790204806. The cubic root of 812476820 is about 933.1189153139.

The spelling of 812476820 in words is "eight hundred twelve million, four hundred seventy-six thousand, eight hundred twenty".