90991886 has 8 divisors (see below), whose sum is σ = 136532784. Its totient is φ = 45480960.

The previous prime is 90991883. The next prime is 90991889. The reversal of 90991886 is 68819909.

It is an interprime number because it is at equal distance from previous prime (90991883) and next prime (90991889).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90991883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3086 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (17066598).

Almost surely, 2^90991886 is an apocalyptic number.

90991886 is a deficient number, since it is larger than the sum of its proper divisors (45540898).

90991886 is a wasteful number, since it uses less digits than its factorization.

90991886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14986.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 90991886 is about 9538.9667155306. The cubic root of 90991886 is about 449.7807755233.

The spelling of 90991886 in words is "ninety million, nine hundred ninety-one thousand, eight hundred eighty-six".