28817040 has 160 divisors (see below), whose sum is σ = 108207360. Its totient is φ = 6193152.

The previous prime is 28817003. The next prime is 28817069. The reversal of 28817040 is 4071882.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28816989 and 28817007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28056 + ... + 29064.

It is an arithmetic number, because the mean of its divisors is an integer number (676296).

Almost surely, 2^28817040 is an apocalyptic number.

28817040 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 28817040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54103680).

28817040 is an abundant number, since it is smaller than the sum of its proper divisors (79390320).

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

28817040 is a wasteful number, since it uses less digits than its factorization.

28817040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28817040 is about 5368.1505194992. The cubic root of 28817040 is about 306.5842143383.

The spelling of 28817040 in words is "twenty-eight million, eight hundred seventeen thousand, forty".