72756523 has 6 divisors (see below), whose sum is σ = 84635196. Its totient is φ = 62362692.

The previous prime is 72756511. The next prime is 72756553. The reversal of 72756523 is 32565727.

It is not a de Polignac number, because 72756523 - 2¹³ = 72748331 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 742365 + ... + 742462.

It is an arithmetic number, because the mean of its divisors is an integer number (14105866).

Almost surely, 2^72756523 is an apocalyptic number.

72756523 is a deficient number, since it is larger than the sum of its proper divisors (11878673).

72756523 is a wasteful number, since it uses less digits than its factorization.

72756523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484841 (or 1484834 counting only the distinct ones).

The product of its digits is 88200, while the sum is 37.

The square root of 72756523 is about 8529.7434310769. The cubic root of 72756523 is about 417.4687569100.

The spelling of 72756523 in words is "seventy-two million, seven hundred fifty-six thousand, five hundred twenty-three".