72521793 has 6 divisors (see below), whose sum is σ = 104753714. Its totient is φ = 48347856.

The previous prime is 72521791. The next prime is 72521809. The reversal of 72521793 is 39712527.

It can be written as a sum of positive squares in only one way, i.e., 57335184 + 15186609 = 7572^2 + 3897^2 .

It is not a de Polignac number, because 72521793 - 2¹ = 72521791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72521791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4028980 + ... + 4028997.

Almost surely, 2^72521793 is an apocalyptic number.

It is an amenable number.

72521793 is a deficient number, since it is larger than the sum of its proper divisors (32231921).

72521793 is a wasteful number, since it uses less digits than its factorization.

72521793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8057983 (or 8057980 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 72521793 is about 8515.9728158326. The cubic root of 72521793 is about 417.0193217761.

It can be divided in two parts, 7252 and 1793, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 72521793 in words is "seventy-two million, five hundred twenty-one thousand, seven hundred ninety-three".