28840194 has 36 divisors (see below), whose sum is σ = 66379014. Its totient is φ = 9018432.

The previous prime is 28840193. The next prime is 28840241. The reversal of 28840194 is 49104882.

It can be written as a sum of positive squares in only one way, i.e., 21206025 + 7634169 = 4605^2 + 2763^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840193) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 93789 + ... + 94095.

Almost surely, 2^28840194 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28840194, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33189507).

28840194 is an abundant number, since it is smaller than the sum of its proper divisors (37538820).

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

28840194 is a wasteful number, since it uses less digits than its factorization.

28840194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28840194 is about 5370.3066951525. The cubic root of 28840194 is about 306.6663040848. Note that the first 3 decimals are identical.

The spelling of 28840194 in words is "twenty-eight million, eight hundred forty thousand, one hundred ninety-four".