812269640520 has 256 divisors, whose sum is σ = 2983652179200. Its totient is φ = 195293306880.

The previous prime is 812269640467. The next prime is 812269640543. The reversal of 812269640520 is 25046962218.

812269640520 is a `hidden beast` number, since 8 + 1 + 2 + 2 + 69 + 64 + 0 + 520 = 666.

812269640520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 69001 + ... + 1276440.

It is an arithmetic number, because the mean of its divisors is an integer number (11654891325).

Almost surely, 2^812269640520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812269640520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1491826089600).

812269640520 is an abundant number, since it is smaller than the sum of its proper divisors (2171382538680).

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

812269640520 is a wasteful number, since it uses less digits than its factorization.

812269640520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345517 (or 1345507 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 812269640520 in words is "eight hundred twelve billion, two hundred sixty-nine million, six hundred forty thousand, five hundred twenty".