28431300 has 36 divisors (see below), whose sum is σ = 82262096. Its totient is φ = 7581600.

The previous prime is 28431269. The next prime is 28431313. The reversal of 28431300 is 313482.

It is a happy number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 47086 + ... + 47685.

Almost surely, 2^28431300 is an apocalyptic number.

28431300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28431300 is an abundant number, since it is smaller than the sum of its proper divisors (53830796).

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

28431300 is a wasteful number, since it uses less digits than its factorization.

28431300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94788 (or 94781 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 28431300 is about 5332.1008992704. The cubic root of 28431300 is about 305.2101033754.

Adding to 28431300 its reverse (313482), we get a palindrome (28744782).

The spelling of 28431300 in words is "twenty-eight million, four hundred thirty-one thousand, three hundred".