28805040 has 120 divisors (see below), whose sum is σ = 105560208. Its totient is φ = 6981120.

The previous prime is 28805017. The next prime is 28805041. The reversal of 28805040 is 4050882.

It is a tau number, because it is divible by the number of its divisors (120).

It is a junction number, because it is equal to n+sod(n) for n = 28804995 and 28805013.

It is not an unprimeable number, because it can be changed into a prime (28805041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6102 + ... + 9738.

Almost surely, 2^28805040 is an apocalyptic number.

28805040 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 28805040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52780104).

28805040 is an abundant number, since it is smaller than the sum of its proper divisors (76755168).

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

28805040 is a wasteful number, since it uses less digits than its factorization.

28805040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667 (or 3658 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 28805040 is about 5367.0326997327. The cubic root of 28805040 is about 306.5416524679.

The spelling of 28805040 in words is "twenty-eight million, eight hundred five thousand, forty".