28039478 has 12 divisors (see below), whose sum is σ = 44324460. Its totient is φ = 13266396.

The previous prime is 28039463. The next prime is 28039523. The reversal of 28039478 is 87493082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32213 + ... + 33071.

It is an arithmetic number, because the mean of its divisors is an integer number (3693705).

Almost surely, 2^28039478 is an apocalyptic number.

28039478 is a deficient number, since it is larger than the sum of its proper divisors (16284982).

28039478 is an frugal number, since it uses more digits than its factorization.

28039478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28039478 is about 5295.2316285504. The cubic root of 28039478 is about 303.8015426203.

The spelling of 28039478 in words is "twenty-eight million, thirty-nine thousand, four hundred seventy-eight".