72756533 has 4 divisors (see below), whose sum is σ = 72809580. Its totient is φ = 72703488.

The previous prime is 72756511. The next prime is 72756553. The reversal of 72756533 is 33565727.

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 8868484 + 63888049 = 2978^2 + 7993^2 .

It is a cyclic number.

It is not a de Polignac number, because 72756533 - 2²² = 68562229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72756503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24410 + ... + 27227.

It is an arithmetic number, because the mean of its divisors is an integer number (18202395).

Almost surely, 2^72756533 is an apocalyptic number.

It is an amenable number.

72756533 is a deficient number, since it is larger than the sum of its proper divisors (53047).

72756533 is a wasteful number, since it uses less digits than its factorization.

72756533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53046.

The product of its digits is 132300, while the sum is 38.

The square root of 72756533 is about 8529.7440172610. The cubic root of 72756533 is about 417.4687760363.

The spelling of 72756533 in words is "seventy-two million, seven hundred fifty-six thousand, five hundred thirty-three".