90169623 has 12 divisors (see below), whose sum is σ = 131815320. Its totient is φ = 59388336.

The previous prime is 90169603. The next prime is 90169631. The reversal of 90169623 is 32696109.

It is not a de Polignac number, because 90169623 - 2¹⁰ = 90168599 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90169603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59608 + ... + 61101.

It is an arithmetic number, because the mean of its divisors is an integer number (10984610).

Almost surely, 2^90169623 is an apocalyptic number.

90169623 is a deficient number, since it is larger than the sum of its proper divisors (41645697).

90169623 is a wasteful number, since it uses less digits than its factorization.

90169623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120798 (or 120795 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 90169623 is about 9495.7686892637. The cubic root of 90169623 is about 448.4218347541.

The spelling of 90169623 in words is "ninety million, one hundred sixty-nine thousand, six hundred twenty-three".