72521738 has 16 divisors (see below), whose sum is σ = 112289760. Its totient is φ = 35110416.

The previous prime is 72521723. The next prime is 72521747. The reversal of 72521738 is 83712527.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72521698 and 72521707.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3320 + ... + 12492.

It is an arithmetic number, because the mean of its divisors is an integer number (7018110).

Almost surely, 2^72521738 is an apocalyptic number.

72521738 is a deficient number, since it is larger than the sum of its proper divisors (39768022).

72521738 is a wasteful number, since it uses less digits than its factorization.

72521738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9301.

The product of its digits is 23520, while the sum is 35.

The square root of 72521738 is about 8515.9695866061. The cubic root of 72521738 is about 417.0192163546.

The spelling of 72521738 in words is "seventy-two million, five hundred twenty-one thousand, seven hundred thirty-eight".