70372009 has 4 divisors (see below), whose sum is σ = 72798660. Its totient is φ = 67945360.

The previous prime is 70371989. The next prime is 70372051. The reversal of 70372009 is 90027307.

It is a happy number.

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 25280784 + 45091225 = 5028^2 + 6715^2 .

It is a cyclic number.

It is not a de Polignac number, because 70372009 - 2¹⁹ = 69847721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70372069) 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, 1213282 + ... + 1213339.

It is an arithmetic number, because the mean of its divisors is an integer number (18199665).

Almost surely, 2^70372009 is an apocalyptic number.

It is an amenable number.

70372009 is a deficient number, since it is larger than the sum of its proper divisors (2426651).

70372009 is a wasteful number, since it uses less digits than its factorization.

70372009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426650.

The product of its (nonzero) digits is 2646, while the sum is 28.

The square root of 70372009 is about 8388.8025963185. The cubic root of 70372009 is about 412.8573143965.

The spelling of 70372009 in words is "seventy million, three hundred seventy-two thousand, nine".