28939194 has 40 divisors (see below), whose sum is σ = 66442068. Its totient is φ = 9408960.

The previous prime is 28939181. The next prime is 28939199. The reversal of 28939194 is 49193982.

It can be written as a sum of positive squares in 2 ways, for example, as 28676025 + 263169 = 5355^2 + 513^2 .

It is not an unprimeable number, because it can be changed into a prime (28939199) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4464 + ... + 8820.

Almost surely, 2^28939194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28939194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33221034).

28939194 is an abundant number, since it is smaller than the sum of its proper divisors (37502874).

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

28939194 is a wasteful number, since it uses less digits than its factorization.

28939194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4412 (or 4403 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 28939194 is about 5379.5161492461. The cubic root of 28939194 is about 307.0168020880.

The spelling of 28939194 in words is "twenty-eight million, nine hundred thirty-nine thousand, one hundred ninety-four".