28827540 has 144 divisors (see below), whose sum is σ = 101267712. Its totient is φ = 6501888.

The previous prime is 28827517. The next prime is 28827553. The reversal of 28827540 is 4572882.

It is a happy number.

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 = 28827495 and 28827504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172537 + ... + 172703.

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

Almost surely, 2^28827540 is an apocalyptic number.

28827540 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 28827540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50633856).

28827540 is an abundant number, since it is smaller than the sum of its proper divisors (72440172).

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

28827540 is a wasteful number, since it uses less digits than its factorization.

28827540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28827540 is about 5369.1284208892. The cubic root of 28827540 is about 306.6214462833.

The spelling of 28827540 in words is "twenty-eight million, eight hundred twenty-seven thousand, five hundred forty".