90785297 has 2 divisors, whose sum is σ = 90785298. Its totient is φ = 90785296.

The previous prime is 90785293. The next prime is 90785371. The reversal of 90785297 is 79258709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86136961 + 4648336 = 9281^2 + 2156^2 .

It is a cyclic number.

It is not a de Polignac number, because 90785297 - 2² = 90785293 is a prime.

It is not a weakly prime, because it can be changed into another prime (90785293) 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, 45392648 + 45392649.

It is an arithmetic number, because the mean of its divisors is an integer number (45392649).

Almost surely, 2^90785297 is an apocalyptic number.

It is an amenable number.

90785297 is a deficient number, since it is larger than the sum of its proper divisors (1).

90785297 is an equidigital number, since it uses as much as digits as its factorization.

90785297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 90785297 is about 9528.1318735626. The cubic root of 90785297 is about 449.4401218101.

The spelling of 90785297 in words is "ninety million, seven hundred eighty-five thousand, two hundred ninety-seven".