28143304 has 32 divisors (see below), whose sum is σ = 60540480. Its totient is φ = 12014784.

The previous prime is 28143287. The next prime is 28143307. The reversal of 28143304 is 40334182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28143307) 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, 16374 + ... + 18010.

It is an arithmetic number, because the mean of its divisors is an integer number (1891890).

Almost surely, 2^28143304 is an apocalyptic number.

It is an amenable number.

28143304 is an abundant number, since it is smaller than the sum of its proper divisors (32397176).

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

28143304 is a wasteful number, since it uses less digits than its factorization.

28143304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 28143304 is about 5305.0262958820. The cubic root of 28143304 is about 304.1760579907.

Adding to 28143304 its reverse (40334182), we get a palindrome (68477486).

The spelling of 28143304 in words is "twenty-eight million, one hundred forty-three thousand, three hundred four".