72109918 has 8 divisors (see below), whose sum is σ = 109998360. Its totient is φ = 35443800.

The previous prime is 72109913. The next prime is 72109951. The reversal of 72109918 is 81990127.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72109913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305433 + ... + 305668.

It is an arithmetic number, because the mean of its divisors is an integer number (13749795).

Almost surely, 2^72109918 is an apocalyptic number.

72109918 is a deficient number, since it is larger than the sum of its proper divisors (37888442).

72109918 is a wasteful number, since it uses less digits than its factorization.

72109918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611162.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 72109918 is about 8491.7558843857. The cubic root of 72109918 is about 416.2283594277.

The spelling of 72109918 in words is "seventy-two million, one hundred nine thousand, nine hundred eighteen".