72729515 has 8 divisors (see below), whose sum is σ = 88922448. Its totient is φ = 57085600.

The previous prime is 72729499. The next prime is 72729521. The reversal of 72729515 is 51592727.

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

It is not a de Polignac number, because 72729515 - 2⁴ = 72729499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136961 + ... + 137490.

It is an arithmetic number, because the mean of its divisors is an integer number (11115306).

Almost surely, 2^72729515 is an apocalyptic number.

72729515 is a deficient number, since it is larger than the sum of its proper divisors (16192933).

72729515 is a wasteful number, since it uses less digits than its factorization.

72729515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274509.

The product of its digits is 44100, while the sum is 38.

The square root of 72729515 is about 8528.1601181028. The cubic root of 72729515 is about 417.4170942267.

The spelling of 72729515 in words is "seventy-two million, seven hundred twenty-nine thousand, five hundred fifteen".