72487521 has 16 divisors (see below), whose sum is σ = 108904320. Its totient is φ = 47643120.

The previous prime is 72487483. The next prime is 72487523. The reversal of 72487521 is 12578427.

It is not a de Polignac number, because 72487521 - 2¹⁰ = 72486497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72487523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16990 + ... + 20823.

It is an arithmetic number, because the mean of its divisors is an integer number (6806520).

Almost surely, 2^72487521 is an apocalyptic number.

72487521 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

72487521 is a deficient number, since it is larger than the sum of its proper divisors (36416799).

72487521 is a wasteful number, since it uses less digits than its factorization.

72487521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37893 (or 37887 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 72487521 is about 8513.9603593158. The cubic root of 72487521 is about 416.9536204305.

The spelling of 72487521 in words is "seventy-two million, four hundred eighty-seven thousand, five hundred twenty-one".