28446840 has 96 divisors (see below), whose sum is σ = 95472000. Its totient is φ = 7338240.

The previous prime is 28446833. The next prime is 28446893. The reversal of 28446840 is 4864482.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28446795 and 28446804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9886 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (994500).

Almost surely, 2^28446840 is an apocalyptic number.

28446840 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 28446840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47736000).

28446840 is an abundant number, since it is smaller than the sum of its proper divisors (67025160).

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

28446840 is a wasteful number, since it uses less digits than its factorization.

28446840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2597 (or 2590 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28446840 is about 5333.5579119383. The cubic root of 28446840 is about 305.2657005650.

The spelling of 28446840 in words is "twenty-eight million, four hundred forty-six thousand, eight hundred forty".