28339880 has 16 divisors (see below), whose sum is σ = 63764820. Its totient is φ = 11335936.

The previous prime is 28339879. The next prime is 28339937. The reversal of 28339880 is 8893382.

It can be written as a sum of positive squares in 2 ways, for example, as 24661156 + 3678724 = 4966^2 + 1918^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354209 + ... + 354288.

Almost surely, 2^28339880 is an apocalyptic number.

28339880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28339880 is an abundant number, since it is smaller than the sum of its proper divisors (35424940).

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

28339880 is a wasteful number, since it uses less digits than its factorization.

28339880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708508 (or 708504 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 28339880 is about 5323.5213909592. The cubic root of 28339880 is about 304.8826207824.

The spelling of 28339880 in words is "twenty-eight million, three hundred thirty-nine thousand, eight hundred eighty".