823220512 has 24 divisors (see below), whose sum is σ = 1716052716. Its totient is φ = 387397632.

The previous prime is 823220507. The next prime is 823220537. The reversal of 823220512 is 215022328.

It can be written as a sum of positive squares in 2 ways, for example, as 655155216 + 168065296 = 25596^2 + 12964^2 .

It is a super-2 number, since 2×823220512² = 1355384022755084288, which contains 22 as substring.

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, 756093 + ... + 757180.

Almost surely, 2^823220512 is an apocalyptic number.

It is an amenable number.

823220512 is an abundant number, since it is smaller than the sum of its proper divisors (892832204).

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

823220512 is a wasteful number, since it uses less digits than its factorization.

823220512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513300 (or 1513292 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 823220512 is about 28691.8196007155. The cubic root of 823220512 is about 937.2139142957.

The spelling of 823220512 in words is "eight hundred twenty-three million, two hundred twenty thousand, five hundred twelve".