856511730 has 48 divisors (see below), whose sum is σ = 2281255704. Its totient is φ = 222831360.

The previous prime is 856511707. The next prime is 856511753. The reversal of 856511730 is 37115658.

856511730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (856511707) and next prime (856511753).

It can be written as a sum of positive squares in 4 ways, for example, as 443649969 + 412861761 = 21063^2 + 20319^2 .

It is a super-2 number, since 2×856511730² = 1467224687255185800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112369 + ... + 119748.

Almost surely, 2^856511730 is an apocalyptic number.

856511730 is an abundant number, since it is smaller than the sum of its proper divisors (1424743974).

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

856511730 is a wasteful number, since it uses less digits than its factorization.

856511730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232171 (or 232168 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 856511730 is about 29266.2216556904. The cubic root of 856511730 is about 949.6810489760.

The spelling of 856511730 in words is "eight hundred fifty-six million, five hundred eleven thousand, seven hundred thirty".