90866791 has 4 divisors (see below), whose sum is σ = 90895000. Its totient is φ = 90838584.

The previous prime is 90866761. The next prime is 90866801. The reversal of 90866791 is 19766809.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90866791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90866731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8541 + ... + 15958.

It is an arithmetic number, because the mean of its divisors is an integer number (22723750).

Almost surely, 2^90866791 is an apocalyptic number.

90866791 is a deficient number, since it is larger than the sum of its proper divisors (28209).

90866791 is a wasteful number, since it uses less digits than its factorization.

90866791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28208.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 90866791 is about 9532.4074084147. The cubic root of 90866791 is about 449.5745625201.

The spelling of 90866791 in words is "ninety million, eight hundred sixty-six thousand, seven hundred ninety-one".