90642405 has 24 divisors (see below), whose sum is σ = 168707232. Its totient is φ = 41436192.

The previous prime is 90642403. The next prime is 90642449. The reversal of 90642405 is 50424609.

It is not a de Polignac number, because 90642405 - 2¹ = 90642403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90642403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60927 + ... + 62396.

It is an arithmetic number, because the mean of its divisors is an integer number (7029468).

Almost surely, 2^90642405 is an apocalyptic number.

It is an amenable number.

90642405 is a deficient number, since it is larger than the sum of its proper divisors (78064827).

90642405 is a wasteful number, since it uses less digits than its factorization.

90642405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123345 (or 123338 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 90642405 is about 9520.6304938276. The cubic root of 90642405 is about 449.2041984342.

The spelling of 90642405 in words is "ninety million, six hundred forty-two thousand, four hundred five".