90097920 has 360 divisors, whose sum is σ = 356146560. Its totient is φ = 21565440.

The previous prime is 90097907. The next prime is 90097921. The reversal of 90097920 is 2979009.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (90097921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1140441 + ... + 1140519.

It is an arithmetic number, because the mean of its divisors is an integer number (989296).

Almost surely, 2^90097920 is an apocalyptic number.

90097920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90097920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178073280).

90097920 is an abundant number, since it is smaller than the sum of its proper divisors (266048640).

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

90097920 is a wasteful number, since it uses less digits than its factorization.

90097920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 90097920 is about 9491.9924146620. The cubic root of 90097920 is about 448.3029413608.

The spelling of 90097920 in words is "ninety million, ninety-seven thousand, nine hundred twenty".