90669823 has 8 divisors (see below), whose sum is σ = 99100800. Its totient is φ = 82583040.

The previous prime is 90669809. The next prime is 90669829. The reversal of 90669823 is 32896609.

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 90669823 - 2²⁵ = 57115391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90669823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90669829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85498 + ... + 86551.

It is an arithmetic number, because the mean of its divisors is an integer number (12387600).

Almost surely, 2^90669823 is an apocalyptic number.

90669823 is a deficient number, since it is larger than the sum of its proper divisors (8430977).

90669823 is a wasteful number, since it uses less digits than its factorization.

90669823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172097.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 90669823 is about 9522.0703105995. The cubic root of 90669823 is about 449.2494864320.

The spelling of 90669823 in words is "ninety million, six hundred sixty-nine thousand, eight hundred twenty-three".