812605920 has 96 divisors (see below), whose sum is σ = 2925393408. Its totient is φ = 185737728.

The previous prime is 812605853. The next prime is 812605973. The reversal of 812605920 is 29506218.

It is a tau number, because it is divible by the number of its divisors (96).

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, 117564 + ... + 124283.

It is an arithmetic number, because the mean of its divisors is an integer number (30472848).

Almost surely, 2^812605920 is an apocalyptic number.

812605920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812605920 is an abundant number, since it is smaller than the sum of its proper divisors (2112787488).

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

812605920 is a wasteful number, since it uses less digits than its factorization.

812605920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241872 (or 241864 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 812605920 is about 28506.2435266382. The cubic root of 812605920 is about 933.1683359124.

The spelling of 812605920 in words is "eight hundred twelve million, six hundred five thousand, nine hundred twenty".