72698609 has 2 divisors, whose sum is σ = 72698610. Its totient is φ = 72698608.

The previous prime is 72698597. The next prime is 72698623. The reversal of 72698609 is 90689627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70090384 + 2608225 = 8372^2 + 1615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72698609 is a prime.

It is a Chen prime.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36349304 + 36349305.

It is an arithmetic number, because the mean of its divisors is an integer number (36349305).

Almost surely, 2^72698609 is an apocalyptic number.

It is an amenable number.

72698609 is a deficient number, since it is larger than the sum of its proper divisors (1).

72698609 is an equidigital number, since it uses as much as digits as its factorization.

72698609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 72698609 is about 8526.3479286269. The cubic root of 72698609 is about 417.3579594976.

The spelling of 72698609 in words is "seventy-two million, six hundred ninety-eight thousand, six hundred nine".