72237521 has 8 divisors (see below), whose sum is σ = 75676800. Its totient is φ = 68861520.

The previous prime is 72237509. The next prime is 72237541. The reversal of 72237521 is 12573227.

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

It is a cyclic number.

It is not a de Polignac number, because 72237521 - 2¹⁰ = 72236497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72237541) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13475 + ... + 18056.

It is an arithmetic number, because the mean of its divisors is an integer number (9459600).

Almost surely, 2^72237521 is an apocalyptic number.

It is an amenable number.

72237521 is a deficient number, since it is larger than the sum of its proper divisors (3439279).

72237521 is a wasteful number, since it uses less digits than its factorization.

72237521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31639.

The product of its digits is 5880, while the sum is 29.

The square root of 72237521 is about 8499.2659094771. The cubic root of 72237521 is about 416.4737287715.

The spelling of 72237521 in words is "seventy-two million, two hundred thirty-seven thousand, five hundred twenty-one".