90117750 has 32 divisors (see below), whose sum is σ = 224935776. Its totient is φ = 24031200.

The previous prime is 90117737. The next prime is 90117757. The reversal of 90117750 is 5771109.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90117757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59329 + ... + 60828.

It is an arithmetic number, because the mean of its divisors is an integer number (7029243).

Almost surely, 2^90117750 is an apocalyptic number.

90117750 is an abundant number, since it is smaller than the sum of its proper divisors (134818026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90117750 is a wasteful number, since it uses less digits than its factorization.

90117750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120177 (or 120167 counting only the distinct ones).

The product of its (nonzero) digits is 2205, while the sum is 30.

The square root of 90117750 is about 9493.0369218707. The cubic root of 90117750 is about 448.3358285248.

Adding to 90117750 its reverse (5771109), we get a palindrome (95888859).

It can be divided in two parts, 9011 and 7750, that added together give a palindrome (16761).

The spelling of 90117750 in words is "ninety million, one hundred seventeen thousand, seven hundred fifty".