28055040 has 160 divisors (see below), whose sum is σ = 96931296. Its totient is φ = 6881280.

The previous prime is 28055021. The next prime is 28055047. The reversal of 28055040 is 4055082.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28055040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28055047) 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, 99700 + ... + 99980.

Almost surely, 2^28055040 is an apocalyptic number.

28055040 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 28055040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48465648).

28055040 is an abundant number, since it is smaller than the sum of its proper divisors (68876256).

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

28055040 is a wasteful number, since it uses less digits than its factorization.

28055040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 28055040 is about 5296.7008599693. The cubic root of 28055040 is about 303.8577358352.

The spelling of 28055040 in words is "twenty-eight million, fifty-five thousand, forty".