72831709 has 2 divisors, whose sum is σ = 72831710. Its totient is φ = 72831708.

The previous prime is 72831683. The next prime is 72831719. The reversal of 72831709 is 90713827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57426084 + 15405625 = 7578^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 72831709 - 2¹⁵ = 72798941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72831719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36415854 + 36415855.

It is an arithmetic number, because the mean of its divisors is an integer number (36415855).

Almost surely, 2^72831709 is an apocalyptic number.

It is an amenable number.

72831709 is a deficient number, since it is larger than the sum of its proper divisors (1).

72831709 is an equidigital number, since it uses as much as digits as its factorization.

72831709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 72831709 is about 8534.1495768471. The cubic root of 72831709 is about 417.6125103445.

The spelling of 72831709 in words is "seventy-two million, eight hundred thirty-one thousand, seven hundred nine".