28039830 has 64 divisors (see below), whose sum is σ = 82833408. Its totient is φ = 5915520.

The previous prime is 28039819. The next prime is 28039853. The reversal of 28039830 is 3893082.

It is a junction number, because it is equal to n+sod(n) for n = 28039791 and 28039800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2406 + ... + 7865.

It is an arithmetic number, because the mean of its divisors is an integer number (1294272).

Almost surely, 2^28039830 is an apocalyptic number.

28039830 is an abundant number, since it is smaller than the sum of its proper divisors (54793578).

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

28039830 is a wasteful number, since it uses less digits than its factorization.

28039830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10301.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 28039830 is about 5295.2648658967. The cubic root of 28039830 is about 303.8028138957.

The spelling of 28039830 in words is "twenty-eight million, thirty-nine thousand, eight hundred thirty".