72521529 has 8 divisors (see below), whose sum is σ = 96859200. Its totient is φ = 48265776.

The previous prime is 72521503. The next prime is 72521531. The reversal of 72521529 is 92512527.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72521529 - 2⁷ = 72521401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72521529.

It is not an unprimeable number, because it can be changed into a prime (72521549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18382 + ... + 21975.

It is an arithmetic number, because the mean of its divisors is an integer number (12107400).

Almost surely, 2^72521529 is an apocalyptic number.

It is an amenable number.

72521529 is a deficient number, since it is larger than the sum of its proper divisors (24337671).

72521529 is a wasteful number, since it uses less digits than its factorization.

72521529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40959.

The product of its digits is 12600, while the sum is 33.

The square root of 72521529 is about 8515.9573155342. The cubic root of 72521529 is about 417.0188157524.

The spelling of 72521529 in words is "seventy-two million, five hundred twenty-one thousand, five hundred twenty-nine".