90435623 has 4 divisors (see below), whose sum is σ = 90518280. Its totient is φ = 90352968.

The previous prime is 90435617. The next prime is 90435637. The reversal of 90435623 is 32653409.

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 90435623 - 2⁴ = 90435607 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 90435623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90435673) 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, 39665 + ... + 41882.

It is an arithmetic number, because the mean of its divisors is an integer number (22629570).

Almost surely, 2^90435623 is an apocalyptic number.

90435623 is a deficient number, since it is larger than the sum of its proper divisors (82657).

90435623 is a wasteful number, since it uses less digits than its factorization.

90435623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82656.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 90435623 is about 9509.7646132804. The cubic root of 90435623 is about 448.8623493601.

The spelling of 90435623 in words is "ninety million, four hundred thirty-five thousand, six hundred twenty-three".