28055000 has 80 divisors (see below), whose sum is σ = 68228160. Its totient is φ = 10800000.

The previous prime is 28054993. The next prime is 28055003. The reversal of 28055000 is 55082.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28055003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 154910 + ... + 155090.

It is an arithmetic number, because the mean of its divisors is an integer number (852852).

Almost surely, 2^28055000 is an apocalyptic number.

28055000 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 28055000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34114080).

28055000 is an abundant number, since it is smaller than the sum of its proper divisors (40173160).

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

28055000 is a wasteful number, since it uses less digits than its factorization.

28055000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 28055000 is about 5296.6970840327. The cubic root of 28055000 is about 303.8575914248.

The spelling of 28055000 in words is "twenty-eight million, fifty-five thousand".