72783709 has 2 divisors, whose sum is σ = 72783710. Its totient is φ = 72783708.

The previous prime is 72783703. The next prime is 72783751. The reversal of 72783709 is 90738727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72420100 + 363609 = 8510^2 + 603^2 .

It is a cyclic number.

It is not a de Polignac number, because 72783709 - 2⁵ = 72783677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72783703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36391854 + 36391855.

It is an arithmetic number, because the mean of its divisors is an integer number (36391855).

Almost surely, 2^72783709 is an apocalyptic number.

It is an amenable number.

72783709 is a deficient number, since it is larger than the sum of its proper divisors (1).

72783709 is an equidigital number, since it uses as much as digits as its factorization.

72783709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 72783709 is about 8531.3368823415. The cubic root of 72783709 is about 417.5207471732.

The spelling of 72783709 in words is "seventy-two million, seven hundred eighty-three thousand, seven hundred nine".