72699518 has 4 divisors (see below), whose sum is σ = 109049280. Its totient is φ = 36349758.

The previous prime is 72699511. The next prime is 72699521. The reversal of 72699518 is 81599627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81599627 = 823 ⋅99149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72699511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18174878 + ... + 18174881.

It is an arithmetic number, because the mean of its divisors is an integer number (27262320).

Almost surely, 2^72699518 is an apocalyptic number.

72699518 is a deficient number, since it is larger than the sum of its proper divisors (36349762).

72699518 is a wasteful number, since it uses less digits than its factorization.

72699518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36349761.

The product of its digits is 272160, while the sum is 47.

The square root of 72699518 is about 8526.4012338149. The cubic root of 72699518 is about 417.3596989936.

The spelling of 72699518 in words is "seventy-two million, six hundred ninety-nine thousand, five hundred eighteen".