28142840 has 64 divisors (see below), whose sum is σ = 69672960. Its totient is φ = 10145920.

The previous prime is 28142839. The next prime is 28142843. The reversal of 28142840 is 4824182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28142843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73289 + ... + 73671.

It is an arithmetic number, because the mean of its divisors is an integer number (1088640).

Almost surely, 2^28142840 is an apocalyptic number.

28142840 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 28142840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34836480).

28142840 is an abundant number, since it is smaller than the sum of its proper divisors (41530120).

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

28142840 is a wasteful number, since it uses less digits than its factorization.

28142840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 28142840 is about 5304.9825635906. The cubic root of 28142840 is about 304.1743863265.

It can be divided in two parts, 28142 and 840, that added together give a palindrome (28982).

The spelling of 28142840 in words is "twenty-eight million, one hundred forty-two thousand, eight hundred forty".