90369945 has 64 divisors (see below), whose sum is σ = 170553600. Its totient is φ = 45319680.

The previous prime is 90369941. The next prime is 90369949. The reversal of 90369945 is 54996309.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90369941) and next prime (90369949).

It is not a de Polignac number, because 90369945 - 2² = 90369941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 90369945.

It is not an unprimeable number, because it can be changed into a prime (90369941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 160234 + ... + 160796.

It is an arithmetic number, because the mean of its divisors is an integer number (2664900).

Almost surely, 2^90369945 is an apocalyptic number.

It is an amenable number.

90369945 is a deficient number, since it is larger than the sum of its proper divisors (80183655).

90369945 is a wasteful number, since it uses less digits than its factorization.

90369945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 641 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 90369945 is about 9506.3107986221. The cubic root of 90369945 is about 448.7536623926.

It can be divided in two parts, 9036 and 9945, that added together give a palindrome (18981).

The spelling of 90369945 in words is "ninety million, three hundred sixty-nine thousand, nine hundred forty-five".