72739409 has 8 divisors (see below), whose sum is σ = 77518080. Its totient is φ = 68095456.

The previous prime is 72739397. The next prime is 72739417. The reversal of 72739409 is 90493727.

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

It is not a de Polignac number, because 72739409 - 2⁴ = 72739393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72739489) 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, 32564 + ... + 34725.

It is an arithmetic number, because the mean of its divisors is an integer number (9689760).

Almost surely, 2^72739409 is an apocalyptic number.

It is an amenable number.

72739409 is a deficient number, since it is larger than the sum of its proper divisors (4778671).

72739409 is a wasteful number, since it uses less digits than its factorization.

72739409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67359.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 72739409 is about 8528.7401766029. The cubic root of 72739409 is about 417.4360216066.

The spelling of 72739409 in words is "seventy-two million, seven hundred thirty-nine thousand, four hundred nine".