28057920 has 112 divisors (see below), whose sum is σ = 97219008. Its totient is φ = 6799360.

The previous prime is 28057891. The next prime is 28057937. The reversal of 28057920 is 2975082.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 9232 + ... + 11888.

Almost surely, 2^28057920 is an apocalyptic number.

28057920 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 28057920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48609504).

28057920 is an abundant number, since it is smaller than the sum of its proper divisors (69161088).

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

28057920 is a wasteful number, since it uses less digits than its factorization.

28057920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2688 (or 2678 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 28057920 is about 5296.9727203375. The cubic root of 28057920 is about 303.8681330203.

The spelling of 28057920 in words is "twenty-eight million, fifty-seven thousand, nine hundred twenty".