72970209 has 12 divisors (see below), whose sum is σ = 113509396. Its totient is φ = 44904672.

The previous prime is 72970199. The next prime is 72970229. The reversal of 72970209 is 90207927.

It can be written as a sum of positive squares in 2 ways, for example, as 47568609 + 25401600 = 6897^2 + 5040^2 .

It is not a de Polignac number, because 72970209 - 2⁷ = 72970081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72970229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311722 + ... + 311955.

Almost surely, 2^72970209 is an apocalyptic number.

It is an amenable number.

72970209 is a deficient number, since it is larger than the sum of its proper divisors (40539187).

72970209 is a wasteful number, since it uses less digits than its factorization.

72970209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623696 (or 623693 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 72970209 is about 8542.2601810060. The cubic root of 72970209 is about 417.8770595309.

The spelling of 72970209 in words is "seventy-two million, nine hundred seventy thousand, two hundred nine".