90859993 has 8 divisors (see below), whose sum is σ = 103902912. Its totient is φ = 77832816.

The previous prime is 90859963. The next prime is 90860047. The reversal of 90859993 is 39995809.

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 90859993 - 2²¹ = 88762841 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90859993.

It is not an unprimeable number, because it can be changed into a prime (90859933) 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, 13746 + ... + 19252.

It is an arithmetic number, because the mean of its divisors is an integer number (12987864).

Almost surely, 2^90859993 is an apocalyptic number.

It is an amenable number.

90859993 is a deficient number, since it is larger than the sum of its proper divisors (13042919).

90859993 is a wasteful number, since it uses less digits than its factorization.

90859993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7871.

The product of its (nonzero) digits is 787320, while the sum is 52.

The square root of 90859993 is about 9532.0508286517. The cubic root of 90859993 is about 449.5633509284.

The spelling of 90859993 in words is "ninety million, eight hundred fifty-nine thousand, nine hundred ninety-three".