90688679 has 4 divisors (see below), whose sum is σ = 92900640. Its totient is φ = 88476720.

The previous prime is 90688673. The next prime is 90688681. The reversal of 90688679 is 97688609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97688609 = 41 ⋅2382649.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90688679 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 90688679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90688673) 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, 1105919 + ... + 1106000.

It is an arithmetic number, because the mean of its divisors is an integer number (23225160).

Almost surely, 2^90688679 is an apocalyptic number.

90688679 is a deficient number, since it is larger than the sum of its proper divisors (2211961).

90688679 is a wasteful number, since it uses less digits than its factorization.

90688679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211960.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 90688679 is about 9523.0603799409. The cubic root of 90688679 is about 449.2806267492.

The spelling of 90688679 in words is "ninety million, six hundred eighty-eight thousand, six hundred seventy-nine".