28183920 has 80 divisors (see below), whose sum is σ = 89434752. Its totient is φ = 7338240.

The previous prime is 28183889. The next prime is 28183921. The reversal of 28183920 is 2938182.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28183921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8955 + ... + 11685.

Almost surely, 2^28183920 is an apocalyptic number.

28183920 is a gapful number since it is divisible by the number (20) 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 28183920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44717376).

28183920 is an abundant number, since it is smaller than the sum of its proper divisors (61250832).

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

28183920 is a wasteful number, since it uses less digits than its factorization.

28183920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28183920 is about 5308.8529834607. The cubic root of 28183920 is about 304.3223151169.

The spelling of 28183920 in words is "twenty-eight million, one hundred eighty-three thousand, nine hundred twenty".