90118779 has 8 divisors (see below), whose sum is σ = 123089232. Its totient is φ = 58613760.

The previous prime is 90118771. The next prime is 90118793. The reversal of 90118779 is 97781109.

It is a happy number.

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

It is not a de Polignac number, because 90118779 - 2³ = 90118771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90118779.

It is not an unprimeable number, because it can be changed into a prime (90118771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366214 + ... + 366459.

It is an arithmetic number, because the mean of its divisors is an integer number (15386154).

Almost surely, 2^90118779 is an apocalyptic number.

90118779 is a deficient number, since it is larger than the sum of its proper divisors (32970453).

90118779 is a wasteful number, since it uses less digits than its factorization.

90118779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732717.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 90118779 is about 9493.0911193352. The cubic root of 90118779 is about 448.3375349434.

The spelling of 90118779 in words is "ninety million, one hundred eighteen thousand, seven hundred seventy-nine".