72698909 has 2 divisors, whose sum is σ = 72698910. Its totient is φ = 72698908.

The previous prime is 72698869. The next prime is 72698957. The reversal of 72698909 is 90989627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37332100 + 35366809 = 6110^2 + 5947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72698909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72698209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36349454 + 36349455.

It is an arithmetic number, because the mean of its divisors is an integer number (36349455).

Almost surely, 2^72698909 is an apocalyptic number.

It is an amenable number.

72698909 is a deficient number, since it is larger than the sum of its proper divisors (1).

72698909 is an equidigital number, since it uses as much as digits as its factorization.

72698909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 72698909 is about 8526.3655211350. The cubic root of 72698909 is about 417.3585335903.

The spelling of 72698909 in words is "seventy-two million, six hundred ninety-eight thousand, nine hundred nine".