28939830 has 16 divisors (see below), whose sum is σ = 69455664. Its totient is φ = 7717280.

The previous prime is 28939829. The next prime is 28939837. The reversal of 28939830 is 3893982.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482301 + ... + 482360.

It is an arithmetic number, because the mean of its divisors is an integer number (4340979).

Almost surely, 2^28939830 is an apocalyptic number.

28939830 is an abundant number, since it is smaller than the sum of its proper divisors (40515834).

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

28939830 is a wasteful number, since it uses less digits than its factorization.

28939830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964671.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 28939830 is about 5379.5752620444. The cubic root of 28939830 is about 307.0190511861.

The spelling of 28939830 in words is "twenty-eight million, nine hundred thirty-nine thousand, eight hundred thirty".