72402709 has 2 divisors, whose sum is σ = 72402710. Its totient is φ = 72402708.

The previous prime is 72402697. The next prime is 72402713. The reversal of 72402709 is 90720427.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42536484 + 29866225 = 6522^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 72402709 - 2¹⁹ = 71878421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72402739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36201354 + 36201355.

It is an arithmetic number, because the mean of its divisors is an integer number (36201355).

Almost surely, 2^72402709 is an apocalyptic number.

It is an amenable number.

72402709 is a deficient number, since it is larger than the sum of its proper divisors (1).

72402709 is an equidigital number, since it uses as much as digits as its factorization.

72402709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 72402709 is about 8508.9781407640. The cubic root of 72402709 is about 416.7909419876.

The spelling of 72402709 in words is "seventy-two million, four hundred two thousand, seven hundred nine".