856521552 has 40 divisors (see below), whose sum is σ = 2254436064. Its totient is φ = 280119424.

The previous prime is 856521521. The next prime is 856521563. The reversal of 856521552 is 255125658.

856521552 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 856521552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165798 + ... + 170885.

Almost surely, 2^856521552 is an apocalyptic number.

It is an amenable number.

856521552 is an abundant number, since it is smaller than the sum of its proper divisors (1397914512).

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

856521552 is a wasteful number, since it uses less digits than its factorization.

856521552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336747 (or 336741 counting only the distinct ones).

The product of its digits is 120000, while the sum is 39.

The square root of 856521552 is about 29266.3894595832. The cubic root of 856521552 is about 949.6846791001.

The spelling of 856521552 in words is "eight hundred fifty-six million, five hundred twenty-one thousand, five hundred fifty-two".