28405260 has 144 divisors (see below), whose sum is σ = 94785600. Its totient is φ = 6842880.

The previous prime is 28405259. The next prime is 28405261. The reversal of 28405260 is 6250482.

It is an interprime number because it is at equal distance from previous prime (28405259) and next prime (28405261).

It is not an unprimeable number, because it can be changed into a prime (28405261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142641 + ... + 142839.

Almost surely, 2^28405260 is an apocalyptic number.

28405260 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 28405260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47392800).

28405260 is an abundant number, since it is smaller than the sum of its proper divisors (66380340).

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

28405260 is a wasteful number, since it uses less digits than its factorization.

28405260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28405260 is about 5329.6585256468. The cubic root of 28405260 is about 305.1168950835.

It can be divided in two parts, 2840 and 5260, that added together give a square (8100 = 90²).

The spelling of 28405260 in words is "twenty-eight million, four hundred five thousand, two hundred sixty".