72204989 has 2 divisors, whose sum is σ = 72204990. Its totient is φ = 72204988.

The previous prime is 72204971. The next prime is 72205033. The reversal of 72204989 is 98940227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71995225 + 209764 = 8485^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 72204989 - 2⁸ = 72204733 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 (72204929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36102494 + 36102495.

It is an arithmetic number, because the mean of its divisors is an integer number (36102495).

Almost surely, 2^72204989 is an apocalyptic number.

It is an amenable number.

72204989 is a deficient number, since it is larger than the sum of its proper divisors (1).

72204989 is an equidigital number, since it uses as much as digits as its factorization.

72204989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 72204989 is about 8497.3518816158. The cubic root of 72204989 is about 416.4112000581.

The spelling of 72204989 in words is "seventy-two million, two hundred four thousand, nine hundred eighty-nine".