820625772 has 24 divisors (see below), whose sum is σ = 1939033600. Its totient is φ = 270079056.

The previous prime is 820625711. The next prime is 820625779. The reversal of 820625772 is 277526028.

It is a self number, because there is not a number n which added to its sum of digits gives 820625772.

It is not an unprimeable number, because it can be changed into a prime (820625779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431872 + ... + 433767.

Almost surely, 2^820625772 is an apocalyptic number.

It is an amenable number.

820625772 is an abundant number, since it is smaller than the sum of its proper divisors (1118407828).

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

820625772 is a wasteful number, since it uses less digits than its factorization.

820625772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865725 (or 865723 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 820625772 is about 28646.5664958298. The cubic root of 820625772 is about 936.2281978853.

The spelling of 820625772 in words is "eight hundred twenty million, six hundred twenty-five thousand, seven hundred seventy-two".