72239457 has 8 divisors (see below), whose sum is σ = 96957760. Its totient is φ = 47840400.

The previous prime is 72239411. The next prime is 72239473. The reversal of 72239457 is 75493227.

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

It is a de Polignac number, because none of the positive numbers 2^k-72239457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72239257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79282 + ... + 80187.

It is an arithmetic number, because the mean of its divisors is an integer number (12119720).

Almost surely, 2^72239457 is an apocalyptic number.

It is an amenable number.

72239457 is a deficient number, since it is larger than the sum of its proper divisors (24718303).

72239457 is a wasteful number, since it uses less digits than its factorization.

72239457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159623.

The product of its digits is 105840, while the sum is 39.

The square root of 72239457 is about 8499.3798009031. The cubic root of 72239457 is about 416.4774493031.

The spelling of 72239457 in words is "seventy-two million, two hundred thirty-nine thousand, four hundred fifty-seven".