90173440 has 208 divisors, whose sum is σ = 268926912. Its totient is φ = 28311552.

The previous prime is 90173437. The next prime is 90173453. The reversal of 90173440 is 4437109.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a zygodrome in base 4 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 90173399 and 90173408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2437102 + ... + 2437138.

Almost surely, 2^90173440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90173440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134463456).

90173440 is an abundant number, since it is smaller than the sum of its proper divisors (178753472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90173440 is a wasteful number, since it uses less digits than its factorization.

90173440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 90173440 is about 9495.9696713922. The cubic root of 90173440 is about 448.4281620956.

The spelling of 90173440 in words is "ninety million, one hundred seventy-three thousand, four hundred forty".