90776891 has 4 divisors (see below), whose sum is σ = 90809784. Its totient is φ = 90744000.

The previous prime is 90776879. The next prime is 90776921. The reversal of 90776891 is 19867709.

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

It is a cyclic number.

It is not a de Polignac number, because 90776891 - 2¹⁸ = 90514747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90776831) 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, 11885 + ... + 17966.

It is an arithmetic number, because the mean of its divisors is an integer number (22702446).

Almost surely, 2^90776891 is an apocalyptic number.

90776891 is a deficient number, since it is larger than the sum of its proper divisors (32893).

90776891 is a wasteful number, since it uses less digits than its factorization.

90776891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32892.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 90776891 is about 9527.6907485497. The cubic root of 90776891 is about 449.4262498492.

The spelling of 90776891 in words is "ninety million, seven hundred seventy-six thousand, eight hundred ninety-one".