28389830 has 32 divisors (see below), whose sum is σ = 61839936. Its totient is φ = 9160704.

The previous prime is 28389793. The next prime is 28389853. The reversal of 28389830 is 3898382.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10739 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (1932498).

Almost surely, 2^28389830 is an apocalyptic number.

28389830 is an abundant number, since it is smaller than the sum of its proper divisors (33450106).

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

28389830 is a wasteful number, since it uses less digits than its factorization.

28389830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23888.

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

The square root of 28389830 is about 5328.2107691044. The cubic root of 28389830 is about 305.0616376368.

The spelling of 28389830 in words is "twenty-eight million, three hundred eighty-nine thousand, eight hundred thirty".