72406318 has 4 divisors (see below), whose sum is σ = 108609480. Its totient is φ = 36203158.

The previous prime is 72406303. The next prime is 72406319. The reversal of 72406318 is 81360427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81360427 = 1021 ⋅79687.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 72406318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72406319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18101578 + ... + 18101581.

It is an arithmetic number, because the mean of its divisors is an integer number (27152370).

Almost surely, 2^72406318 is an apocalyptic number.

72406318 is a deficient number, since it is larger than the sum of its proper divisors (36203162).

72406318 is a wasteful number, since it uses less digits than its factorization.

72406318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36203161.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 72406318 is about 8509.1902082396. The cubic root of 72406318 is about 416.7978670210.

The spelling of 72406318 in words is "seventy-two million, four hundred six thousand, three hundred eighteen".