72521512 has 16 divisors (see below), whose sum is σ = 155403360. Its totient is φ = 31080624.

The previous prime is 72521503. The next prime is 72521531. The reversal of 72521512 is 21512527.

It is a super-2 number, since 2×72521512² = 10518739405532288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647458 + ... + 647569.

It is an arithmetic number, because the mean of its divisors is an integer number (9712710).

Almost surely, 2^72521512 is an apocalyptic number.

It is an amenable number.

72521512 is an abundant number, since it is smaller than the sum of its proper divisors (82881848).

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

72521512 is a wasteful number, since it uses less digits than its factorization.

72521512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295040 (or 1295036 counting only the distinct ones).

The product of its digits is 1400, while the sum is 25.

The square root of 72521512 is about 8515.9563174079. The cubic root of 72521512 is about 417.0187831675.

The spelling of 72521512 in words is "seventy-two million, five hundred twenty-one thousand, five hundred twelve".