72427521 has 16 divisors (see below), whose sum is σ = 98729280. Its totient is φ = 47211840.

The previous prime is 72427519. The next prime is 72427547. The reversal of 72427521 is 12572427.

It is not a de Polignac number, because 72427521 - 2¹ = 72427519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72427561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61266 + ... + 62436.

It is an arithmetic number, because the mean of its divisors is an integer number (6170580).

Almost surely, 2^72427521 is an apocalyptic number.

It is an amenable number.

72427521 is a deficient number, since it is larger than the sum of its proper divisors (26301759).

72427521 is a wasteful number, since it uses less digits than its factorization.

72427521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its digits is 7840, while the sum is 30.

The square root of 72427521 is about 8510.4360052820. The cubic root of 72427521 is about 416.8385471850.

Adding to 72427521 its reverse (12572427), we get a palindrome (84999948).

The spelling of 72427521 in words is "seventy-two million, four hundred twenty-seven thousand, five hundred twenty-one".