90173920 has 24 divisors (see below), whose sum is σ = 213036264. Its totient is φ = 36069504.

The previous prime is 90173917. The next prime is 90173927. The reversal of 90173920 is 2937109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90173927) 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, 281634 + ... + 281953.

It is an arithmetic number, because the mean of its divisors is an integer number (8876511).

Almost surely, 2^90173920 is an apocalyptic number.

It is an amenable number.

90173920 is an abundant number, since it is smaller than the sum of its proper divisors (122862344).

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

90173920 is a wasteful number, since it uses less digits than its factorization.

90173920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563602 (or 563594 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 90173920 is about 9495.9949452388. The cubic root of 90173920 is about 448.4289577664.

The spelling of 90173920 in words is "ninety million, one hundred seventy-three thousand, nine hundred twenty".