13081572 has 144 divisors (see below), whose sum is σ = 41164032. Its totient is φ = 3421440.

The previous prime is 13081559. The next prime is 13081573. The reversal of 13081572 is 27518031.

13081572 is a `hidden beast` number, since 13 + 0 + 81 + 572 = 666.

It is a super-2 number, since 2×13081572² = 342255051982368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13081573) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214422 + ... + 214482.

Almost surely, 2^13081572 is an apocalyptic number.

13081572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13081572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20582016).

13081572 is an abundant number, since it is smaller than the sum of its proper divisors (28082460).

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

13081572 is a wasteful number, since it uses less digits than its factorization.

13081572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 13081572 is about 3616.8455869722. The cubic root of 13081572 is about 235.6242464451.

The spelling of 13081572 in words is "thirteen million, eighty-one thousand, five hundred seventy-two".