28711140 has 48 divisors (see below), whose sum is σ = 80949120. Its totient is φ = 7603200.

The previous prime is 28711121. The next prime is 28711157. The reversal of 28711140 is 4111782.

It is a self number, because there is not a number n which added to its sum of digits gives 28711140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7476 + ... + 10644.

It is an arithmetic number, because the mean of its divisors is an integer number (1686440).

Almost surely, 2^28711140 is an apocalyptic number.

28711140 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 28711140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40474560).

28711140 is an abundant number, since it is smaller than the sum of its proper divisors (52237980).

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

28711140 is a wasteful number, since it uses less digits than its factorization.

28711140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332 (or 3330 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 28711140 is about 5358.2777083686. The cubic root of 28711140 is about 306.2081969875.

The spelling of 28711140 in words is "twenty-eight million, seven hundred eleven thousand, one hundred forty".