72729518 has 4 divisors (see below), whose sum is σ = 109094280. Its totient is φ = 36364758.

The previous prime is 72729499. The next prime is 72729521. The reversal of 72729518 is 81592727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81592727 = 6659 ⋅12253.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18182378 + ... + 18182381.

It is an arithmetic number, because the mean of its divisors is an integer number (27273570).

Almost surely, 2^72729518 is an apocalyptic number.

72729518 is a deficient number, since it is larger than the sum of its proper divisors (36364762).

72729518 is a wasteful number, since it uses less digits than its factorization.

72729518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36364761.

The product of its digits is 70560, while the sum is 41.

The square root of 72729518 is about 8528.1602939907. The cubic root of 72729518 is about 417.4170999660.

The spelling of 72729518 in words is "seventy-two million, seven hundred twenty-nine thousand, five hundred eighteen".