72439523 has 8 divisors (see below), whose sum is σ = 78785616. Its totient is φ = 66204000.

The previous prime is 72439519. The next prime is 72439537. The reversal of 72439523 is 32593427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72439523 - 2² = 72439519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72439573) 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 7 ways as a sum of consecutive naturals, for example, 26273 + ... + 28898.

It is an arithmetic number, because the mean of its divisors is an integer number (9848202).

Almost surely, 2^72439523 is an apocalyptic number.

72439523 is a deficient number, since it is larger than the sum of its proper divisors (6346093).

72439523 is a wasteful number, since it uses less digits than its factorization.

72439523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55285.

The product of its digits is 45360, while the sum is 35.

The square root of 72439523 is about 8511.1411103330. The cubic root of 72439523 is about 416.8615707533.

The spelling of 72439523 in words is "seventy-two million, four hundred thirty-nine thousand, five hundred twenty-three".