28139696 has 40 divisors (see below), whose sum is σ = 59735760. Its totient is φ = 12761856.

The previous prime is 28139689. The next prime is 28139707. The reversal of 28139696 is 69693182.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11126 + ... + 13418.

It is an arithmetic number, because the mean of its divisors is an integer number (1493394).

Almost surely, 2^28139696 is an apocalyptic number.

28139696 is a gapful number since it is divisible by the number (26) 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 28139696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29867880).

28139696 is an abundant number, since it is smaller than the sum of its proper divisors (31596064).

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

28139696 is a wasteful number, since it uses less digits than its factorization.

28139696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373 (or 2367 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 28139696 is about 5304.6862301177. The cubic root of 28139696 is about 304.1630588759.

The spelling of 28139696 in words is "twenty-eight million, one hundred thirty-nine thousand, six hundred ninety-six".