8899920 has 120 divisors (see below), whose sum is σ = 30640896. Its totient is φ = 2313984.

The previous prime is 8899909. The next prime is 8899927. The reversal of 8899920 is 299988.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8899927) 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 23 ways as a sum of consecutive naturals, for example, 33709 + ... + 33971.

Almost surely, 2^8899920 is an apocalyptic number.

8899920 is a gapful number since it is divisible by the number (80) 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 8899920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15320448).

8899920 is an abundant number, since it is smaller than the sum of its proper divisors (21740976).

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

8899920 is a wasteful number, since it uses less digits than its factorization.

8899920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 8899920 is about 2983.2733699747. The cubic root of 8899920 is about 207.2344888749.

The spelling of 8899920 in words is "eight million, eight hundred ninety-nine thousand, nine hundred twenty".