90217909268 has 6 divisors (see below), whose sum is σ = 157881341226. Its totient is φ = 45108954632.

The previous prime is 90217909237. The next prime is 90217909279. The reversal of 90217909268 is 86290971209.

It can be written as a sum of positive squares in only one way, i.e., 72168524164 + 18049385104 = 268642^2 + 134348^2 .

It is a congruent number.

It is an unprimeable number.

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, 11277238655 + ... + 11277238662.

It is an arithmetic number, because the mean of its divisors is an integer number (26313556871).

Almost surely, 2^90217909268 is an apocalyptic number.

It is an amenable number.

90217909268 is a deficient number, since it is larger than the sum of its proper divisors (67663431958).

90217909268 is a wasteful number, since it uses less digits than its factorization.

90217909268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22554477321 (or 22554477319 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 90217909268 in words is "ninety billion, two hundred seventeen million, nine hundred nine thousand, two hundred sixty-eight".