28140684 has 144 divisors (see below), whose sum is σ = 83241984. Its totient is φ = 7286400.

The previous prime is 28140647. The next prime is 28140709. The reversal of 28140684 is 48604182.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 907749 + ... + 907779.

Almost surely, 2^28140684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28140684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41620992).

28140684 is an abundant number, since it is smaller than the sum of its proper divisors (55101300).

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

28140684 is a wasteful number, since it uses less digits than its factorization.

28140684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 28140684 is about 5304.7793545067. The cubic root of 28140684 is about 304.1666186109.

The spelling of 28140684 in words is "twenty-eight million, one hundred forty thousand, six hundred eighty-four".