28709408 has 48 divisors (see below), whose sum is σ = 69572160. Its totient is φ = 11356416.

The previous prime is 28709383. The next prime is 28709419. The reversal of 28709408 is 80490782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2018 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (1449420).

Almost surely, 2^28709408 is an apocalyptic number.

28709408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28709408 is an abundant number, since it is smaller than the sum of its proper divisors (40862752).

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

28709408 is a wasteful number, since it uses less digits than its factorization.

28709408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9889 (or 9881 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28709408 is about 5358.1160868350. The cubic root of 28709408 is about 306.2020395255.

The spelling of 28709408 in words is "twenty-eight million, seven hundred nine thousand, four hundred eight".