90668557 has 8 divisors (see below), whose sum is σ = 103977216. Its totient is φ = 77448912.

The previous prime is 90668533. The next prime is 90668561. The reversal of 90668557 is 75586609.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90668557 - 2¹¹ = 90666509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90668527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20053 + ... + 24154.

It is an arithmetic number, because the mean of its divisors is an integer number (12997152).

Almost surely, 2^90668557 is an apocalyptic number.

It is an amenable number.

90668557 is a deficient number, since it is larger than the sum of its proper divisors (13308659).

90668557 is a wasteful number, since it uses less digits than its factorization.

90668557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44507.

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 90668557 is about 9522.0038332275. The cubic root of 90668557 is about 449.2473955029.

The spelling of 90668557 in words is "ninety million, six hundred sixty-eight thousand, five hundred fifty-seven".