28139076 has 120 divisors (see below), whose sum is σ = 88630080. Its totient is φ = 7604928.

The previous prime is 28139053. The next prime is 28139081. The reversal of 28139076 is 67093182.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28139076.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42766 + ... + 43418.

It is an arithmetic number, because the mean of its divisors is an integer number (738584).

Almost surely, 2^28139076 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 28139076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44315040).

28139076 is an abundant number, since it is smaller than the sum of its proper divisors (60491004).

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

28139076 is a wasteful number, since it uses less digits than its factorization.

28139076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28139076 is about 5304.6277909011. The cubic root of 28139076 is about 304.1608249915.

The spelling of 28139076 in words is "twenty-eight million, one hundred thirty-nine thousand, seventy-six".