72839818 has 4 divisors (see below), whose sum is σ = 109259730. Its totient is φ = 36419908.

The previous prime is 72839797. The next prime is 72839831. The reversal of 72839818 is 81893827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81893827 = 149 ⋅549623.

It can be written as a sum of positive squares in only one way, i.e., 68013009 + 4826809 = 8247^2 + 2197^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18209953 + ... + 18209956.

Almost surely, 2^72839818 is an apocalyptic number.

72839818 is a deficient number, since it is larger than the sum of its proper divisors (36419912).

72839818 is a wasteful number, since it uses less digits than its factorization.

72839818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36419911.

The product of its digits is 193536, while the sum is 46.

The square root of 72839818 is about 8534.6246548984. The cubic root of 72839818 is about 417.6280086040.

The spelling of 72839818 in words is "seventy-two million, eight hundred thirty-nine thousand, eight hundred eighteen".