30831211520 has 88 divisors (see below), whose sum is σ = 74692295208. Its totient is φ = 12210176000.

The previous prime is 30831211469. The next prime is 30831211549. The reversal of 30831211520 is 2511213803.

It can be written as a sum of positive squares in 4 ways, for example, as 15904236544 + 14926974976 = 126112^2 + 122176^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30831211520.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487310 + ... + 546930.

Almost surely, 2^30831211520 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 30831211520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37346147604).

30831211520 is an abundant number, since it is smaller than the sum of its proper divisors (43861083688).

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

30831211520 is a wasteful number, since it uses less digits than its factorization.

30831211520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59747 (or 59729 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 30831211520 in words is "thirty billion, eight hundred thirty-one million, two hundred eleven thousand, five hundred twenty".