72418985 has 4 divisors (see below), whose sum is σ = 86902788. Its totient is φ = 57935184.

The previous prime is 72418981. The next prime is 72419021. The reversal of 72418985 is 58981427.

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 19114384 + 53304601 = 4372^2 + 7301^2 .

It is a cyclic number.

It is not a de Polignac number, because 72418985 - 2² = 72418981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72418981) 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, 7241894 + ... + 7241903.

It is an arithmetic number, because the mean of its divisors is an integer number (21725697).

Almost surely, 2^72418985 is an apocalyptic number.

It is an amenable number.

72418985 is a deficient number, since it is larger than the sum of its proper divisors (14483803).

72418985 is a wasteful number, since it uses less digits than its factorization.

72418985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14483802.

The product of its digits is 161280, while the sum is 44.

The square root of 72418985 is about 8509.9344885845. The cubic root of 72418985 is about 416.8221709348.

The spelling of 72418985 in words is "seventy-two million, four hundred eighteen thousand, nine hundred eighty-five".