72670009 has 4 divisors (see below), whose sum is σ = 73754704. Its totient is φ = 71585316.

The previous prime is 72670007. The next prime is 72670033. The reversal of 72670009 is 90007627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72670009 - 2¹ = 72670007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72670007) 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, 542247 + ... + 542380.

It is an arithmetic number, because the mean of its divisors is an integer number (18438676).

Almost surely, 2^72670009 is an apocalyptic number.

It is an amenable number.

72670009 is a deficient number, since it is larger than the sum of its proper divisors (1084695).

72670009 is a wasteful number, since it uses less digits than its factorization.

72670009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084694.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72670009 is about 8524.6706094723. The cubic root of 72670009 is about 417.3032220759.

The spelling of 72670009 in words is "seventy-two million, six hundred seventy thousand, nine".