72304997 has 2 divisors, whose sum is σ = 72304998. Its totient is φ = 72304996.

The previous prime is 72304957. The next prime is 72305003. The reversal of 72304997 is 79940327.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71081761 + 1223236 = 8431^2 + 1106^2 .

It is a cyclic number.

It is not a de Polignac number, because 72304997 - 2⁶ = 72304933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72304907) 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, 36152498 + 36152499.

It is an arithmetic number, because the mean of its divisors is an integer number (36152499).

Almost surely, 2^72304997 is an apocalyptic number.

It is an amenable number.

72304997 is a deficient number, since it is larger than the sum of its proper divisors (1).

72304997 is an equidigital number, since it uses as much as digits as its factorization.

72304997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 72304997 is about 8503.2345022350. The cubic root of 72304997 is about 416.6033624004.

The spelling of 72304997 in words is "seventy-two million, three hundred four thousand, nine hundred ninety-seven".