28134540 has 144 divisors (see below), whose sum is σ = 101267712. Its totient is φ = 6422976.

The previous prime is 28134539. The next prime is 28134551. The reversal of 28134540 is 4543182.

28134540 is a `hidden beast` number, since 281 + 345 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33607 + ... + 34433.

It is an arithmetic number, because the mean of its divisors is an integer number (703248).

Almost surely, 2^28134540 is an apocalyptic number.

28134540 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 28134540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50633856).

28134540 is an abundant number, since it is smaller than the sum of its proper divisors (73133172).

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

28134540 is a wasteful number, since it uses less digits than its factorization.

28134540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 844 counting only the distinct ones).

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

The square root of 28134540 is about 5304.2002224652. The cubic root of 28134540 is about 304.1444806069.

The spelling of 28134540 in words is "twenty-eight million, one hundred thirty-four thousand, five hundred forty".