90718791 has 8 divisors (see below), whose sum is σ = 121701120. Its totient is φ = 60107832.

The previous prime is 90718729. The next prime is 90718841. The reversal of 90718791 is 19781709.

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 90718791 - 2²¹ = 88621639 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90718091) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 92271 + ... + 93248.

It is an arithmetic number, because the mean of its divisors is an integer number (15212640).

Almost surely, 2^90718791 is an apocalyptic number.

90718791 is a deficient number, since it is larger than the sum of its proper divisors (30982329).

90718791 is a wasteful number, since it uses less digits than its factorization.

90718791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185685.

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

The square root of 90718791 is about 9524.6412530866. The cubic root of 90718791 is about 449.3303471822.

The spelling of 90718791 in words is "ninety million, seven hundred eighteen thousand, seven hundred ninety-one".