72488309 has 2 divisors, whose sum is σ = 72488310. Its totient is φ = 72488308.

The previous prime is 72488281. The next prime is 72488321. The reversal of 72488309 is 90388427.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68840209 + 3648100 = 8297^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 72488309 - 2¹² = 72484213 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 (72488329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36244154 + 36244155.

It is an arithmetic number, because the mean of its divisors is an integer number (36244155).

Almost surely, 2^72488309 is an apocalyptic number.

It is an amenable number.

72488309 is a deficient number, since it is larger than the sum of its proper divisors (1).

72488309 is an equidigital number, since it uses as much as digits as its factorization.

72488309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 72488309 is about 8514.0066361261. The cubic root of 72488309 is about 416.9551313033.

The spelling of 72488309 in words is "seventy-two million, four hundred eighty-eight thousand, three hundred nine".