72902909 has 2 divisors, whose sum is σ = 72902910. Its totient is φ = 72902908.

The previous prime is 72902861. The next prime is 72902927. The reversal of 72902909 is 90920927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67190809 + 5712100 = 8197^2 + 2390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72902909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72902009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36451454 + 36451455.

It is an arithmetic number, because the mean of its divisors is an integer number (36451455).

Almost surely, 2^72902909 is an apocalyptic number.

It is an amenable number.

72902909 is a deficient number, since it is larger than the sum of its proper divisors (1).

72902909 is an equidigital number, since it uses as much as digits as its factorization.

72902909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 72902909 is about 8538.3200338240. The cubic root of 72902909 is about 417.7485514870.

The spelling of 72902909 in words is "seventy-two million, nine hundred two thousand, nine hundred nine".