72072997 has 2 divisors, whose sum is σ = 72072998. Its totient is φ = 72072996.

The previous prime is 72072983. The next prime is 72073021. The reversal of 72072997 is 79927027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66569281 + 5503716 = 8159^2 + 2346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72072997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72072937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36036498 + 36036499.

It is an arithmetic number, because the mean of its divisors is an integer number (36036499).

Almost surely, 2^72072997 is an apocalyptic number.

It is an amenable number.

72072997 is a deficient number, since it is larger than the sum of its proper divisors (1).

72072997 is an equidigital number, since it uses as much as digits as its factorization.

72072997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 43.

The square root of 72072997 is about 8489.5816740285. The cubic root of 72072997 is about 416.1573096044.

The spelling of 72072997 in words is "seventy-two million, seventy-two thousand, nine hundred ninety-seven".