13004012520 has 96 divisors (see below), whose sum is σ = 42295429800. Its totient is φ = 3465079296.

The previous prime is 13004012519. The next prime is 13004012537. The reversal of 13004012520 is 2521040031.

13004012520 is a `hidden beast` number, since 13 + 0 + 0 + 401 + 252 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11274617124 + 1729395396 = 106182^2 + 41586^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 13004012493 and 13004012502.

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, 481126 + ... + 507434.

Almost surely, 2^13004012520 is an apocalyptic number.

13004012520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13004012520 is an abundant number, since it is smaller than the sum of its proper divisors (29291417280).

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

13004012520 is a wasteful number, since it uses less digits than its factorization.

13004012520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27699 (or 27692 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 13004012520 its reverse (2521040031), we get a palindrome (15525052551).

The spelling of 13004012520 in words is "thirteen billion, four million, twelve thousand, five hundred twenty".