28193430 has 32 divisors (see below), whose sum is σ = 68304384. Its totient is φ = 7447136.

The previous prime is 28193419. The next prime is 28193437. The reversal of 28193430 is 3439182.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28193437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (2134512).

Almost surely, 2^28193430 is an apocalyptic number.

28193430 is an abundant number, since it is smaller than the sum of its proper divisors (40110954).

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

28193430 is a wasteful number, since it uses less digits than its factorization.

28193430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8900.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28193430 is about 5309.7485816185. The cubic root of 28193430 is about 304.3565400670.

The spelling of 28193430 in words is "twenty-eight million, one hundred ninety-three thousand, four hundred thirty".