90117749 has 8 divisors (see below), whose sum is σ = 95228160. Its totient is φ = 85106736.

The previous prime is 90117737. The next prime is 90117757. The reversal of 90117749 is 94771109.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90117749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90117719) 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, 22982 + ... + 26615.

It is an arithmetic number, because the mean of its divisors is an integer number (11903520).

Almost surely, 2^90117749 is an apocalyptic number.

It is an amenable number.

90117749 is a deficient number, since it is larger than the sum of its proper divisors (5110411).

90117749 is a wasteful number, since it uses less digits than its factorization.

90117749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49699.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 90117749 is about 9493.0368692005. The cubic root of 90117749 is about 448.3358268665.

The spelling of 90117749 in words is "ninety million, one hundred seventeen thousand, seven hundred forty-nine".