82702409 has 2 divisors, whose sum is σ = 82702410. Its totient is φ = 82702408.

The previous prime is 82702393. The next prime is 82702429. The reversal of 82702409 is 90420728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44262409 + 38440000 = 6653^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 82702409 - 2⁴ = 82702393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (82702429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41351204 + 41351205.

It is an arithmetic number, because the mean of its divisors is an integer number (41351205).

Almost surely, 2^82702409 is an apocalyptic number.

It is an amenable number.

82702409 is a deficient number, since it is larger than the sum of its proper divisors (1).

82702409 is an equidigital number, since it uses as much as digits as its factorization.

82702409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 82702409 is about 9094.0864851837. The cubic root of 82702409 is about 435.6851123248.

The spelling of 82702409 in words is "eighty-two million, seven hundred two thousand, four hundred nine".