82787609 has 2 divisors, whose sum is σ = 82787610. Its totient is φ = 82787608.

The previous prime is 82787591. The next prime is 82787629. The reversal of 82787609 is 90678728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63952009 + 18835600 = 7997^2 + 4340^2 .

It is a cyclic number.

It is not a de Polignac number, because 82787609 - 2²⁴ = 66010393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82787629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41393804 + 41393805.

It is an arithmetic number, because the mean of its divisors is an integer number (41393805).

Almost surely, 2^82787609 is an apocalyptic number.

It is an amenable number.

82787609 is a deficient number, since it is larger than the sum of its proper divisors (1).

82787609 is an equidigital number, since it uses as much as digits as its factorization.

82787609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 82787609 is about 9098.7696421000. The cubic root of 82787609 is about 435.8346752060.

The spelling of 82787609 in words is "eighty-two million, seven hundred eighty-seven thousand, six hundred nine".