72405118 has 4 divisors (see below), whose sum is σ = 108607680. Its totient is φ = 36202558.

The previous prime is 72405107. The next prime is 72405167. The reversal of 72405118 is 81150427.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×72405118² = 10485002225187848, which contains 22 as substring.

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, 18101278 + ... + 18101281.

It is an arithmetic number, because the mean of its divisors is an integer number (27151920).

Almost surely, 2^72405118 is an apocalyptic number.

72405118 is a deficient number, since it is larger than the sum of its proper divisors (36202562).

72405118 is a wasteful number, since it uses less digits than its factorization.

72405118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36202561.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 72405118 is about 8509.1196959498. The cubic root of 72405118 is about 416.7955644585.

The spelling of 72405118 in words is "seventy-two million, four hundred five thousand, one hundred eighteen".