72470639 has 2 divisors, whose sum is σ = 72470640. Its totient is φ = 72470638.

The previous prime is 72470633. The next prime is 72470647. The reversal of 72470639 is 93607427.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72470639 - 2¹² = 72466543 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 (72470633) 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, 36235319 + 36235320.

It is an arithmetic number, because the mean of its divisors is an integer number (36235320).

Almost surely, 2^72470639 is an apocalyptic number.

72470639 is a deficient number, since it is larger than the sum of its proper divisors (1).

72470639 is an equidigital number, since it uses as much as digits as its factorization.

72470639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 72470639 is about 8512.9688710813. The cubic root of 72470639 is about 416.9212490768.

The spelling of 72470639 in words is "seventy-two million, four hundred seventy thousand, six hundred thirty-nine".