90450405 has 32 divisors (see below), whose sum is σ = 165995520. Its totient is φ = 46681920.

The previous prime is 90450403. The next prime is 90450407. The reversal of 90450405 is 50405409.

It is an interprime number because it is at equal distance from previous prime (90450403) and next prime (90450407).

It is not a de Polignac number, because 90450405 - 2¹ = 90450403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90450401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6622 + ... + 14991.

It is an arithmetic number, because the mean of its divisors is an integer number (5187360).

Almost surely, 2^90450405 is an apocalyptic number.

It is an amenable number.

90450405 is a deficient number, since it is larger than the sum of its proper divisors (75545115).

90450405 is a wasteful number, since it uses less digits than its factorization.

90450405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21658 (or 21652 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 90450405 is about 9510.5417826746. The cubic root of 90450405 is about 448.8868040369.

The spelling of 90450405 in words is "ninety million, four hundred fifty thousand, four hundred five".