28860240 has 80 divisors (see below), whose sum is σ = 94190400. Its totient is φ = 7289856.

The previous prime is 28860233. The next prime is 28860253. The reversal of 28860240 is 4206882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 28860198 and 28860207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1396 + ... + 7724.

It is an arithmetic number, because the mean of its divisors is an integer number (1177380).

Almost surely, 2^28860240 is an apocalyptic number.

28860240 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 28860240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47095200).

28860240 is an abundant number, since it is smaller than the sum of its proper divisors (65330160).

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

28860240 is a wasteful number, since it uses less digits than its factorization.

28860240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364 (or 6358 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28860240 is about 5372.1727448026. The cubic root of 28860240 is about 306.7373393095.

The spelling of 28860240 in words is "twenty-eight million, eight hundred sixty thousand, two hundred forty".