72370909 has 4 divisors (see below), whose sum is σ = 77937916. Its totient is φ = 66803904.

The previous prime is 72370901. The next prime is 72370913. The reversal of 72370909 is 90907327.

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 23328900 + 49042009 = 4830^2 + 7003^2 .

It is a cyclic number.

It is not a de Polignac number, because 72370909 - 2³ = 72370901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72370901) 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, 2783484 + ... + 2783509.

It is an arithmetic number, because the mean of its divisors is an integer number (19484479).

Almost surely, 2^72370909 is an apocalyptic number.

It is an amenable number.

72370909 is a deficient number, since it is larger than the sum of its proper divisors (5567007).

72370909 is a wasteful number, since it uses less digits than its factorization.

72370909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5567006.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 72370909 is about 8507.1093210326. The cubic root of 72370909 is about 416.7299134569.

The spelling of 72370909 in words is "seventy-two million, three hundred seventy thousand, nine hundred nine".