72981529 has 4 divisors (see below), whose sum is σ = 73141684. Its totient is φ = 72821376.

The previous prime is 72981511. The next prime is 72981563. The reversal of 72981529 is 92518927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24651225 + 48330304 = 4965^2 + 6952^2 .

It is a cyclic number.

It is not a de Polignac number, because 72981529 - 2⁵ = 72981497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72981509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79392 + ... + 80305.

It is an arithmetic number, because the mean of its divisors is an integer number (18285421).

Almost surely, 2^72981529 is an apocalyptic number.

It is an amenable number.

72981529 is a deficient number, since it is larger than the sum of its proper divisors (160155).

72981529 is a wasteful number, since it uses less digits than its factorization.

72981529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160154.

The product of its digits is 90720, while the sum is 43.

The square root of 72981529 is about 8542.9227434175. The cubic root of 72981529 is about 417.8986670874.

The spelling of 72981529 in words is "seventy-two million, nine hundred eighty-one thousand, five hundred twenty-nine".