90405503 has 4 divisors (see below), whose sum is σ = 90459000. Its totient is φ = 90352008.

The previous prime is 90405493. The next prime is 90405521. The reversal of 90405503 is 30550409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30550409 = 449 ⋅68041.

It is a cyclic number.

It is not a de Polignac number, because 90405503 - 2²⁶ = 23296639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90405563) 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, 24128 + ... + 27621.

It is an arithmetic number, because the mean of its divisors is an integer number (22614750).

Almost surely, 2^90405503 is an apocalyptic number.

90405503 is a deficient number, since it is larger than the sum of its proper divisors (53497).

90405503 is a wasteful number, since it uses less digits than its factorization.

90405503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53496.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 90405503 is about 9508.1808459873. The cubic root of 90405503 is about 448.8125119372.

The spelling of 90405503 in words is "ninety million, four hundred five thousand, five hundred three".