72718133 has 4 divisors (see below), whose sum is σ = 74491788. Its totient is φ = 70944480.

The previous prime is 72718123. The next prime is 72718181. The reversal of 72718133 is 33181727.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23746129 + 48972004 = 4873^2 + 6998^2 .

It is a cyclic number.

It is not a de Polignac number, because 72718133 - 2⁶ = 72718069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72718133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72718123) 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, 886766 + ... + 886847.

It is an arithmetic number, because the mean of its divisors is an integer number (18622947).

Almost surely, 2^72718133 is an apocalyptic number.

It is an amenable number.

72718133 is a deficient number, since it is larger than the sum of its proper divisors (1773655).

72718133 is a wasteful number, since it uses less digits than its factorization.

72718133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773654.

The product of its digits is 7056, while the sum is 32.

The square root of 72718133 is about 8527.4927733772. The cubic root of 72718133 is about 417.3953181558.

The spelling of 72718133 in words is "seventy-two million, seven hundred eighteen thousand, one hundred thirty-three".