28196400 has 60 divisors (see below), whose sum is σ = 90326312. Its totient is φ = 7518720.

The previous prime is 28196369. The next prime is 28196401. The reversal of 28196400 is 469182.

It is a tau number, because it is divible by the number of its divisors (60).

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 (28196401) 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 11 ways as a sum of consecutive naturals, for example, 10549 + ... + 12948.

Almost surely, 2^28196400 is an apocalyptic number.

28196400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28196400 is an abundant number, since it is smaller than the sum of its proper divisors (62129912).

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

28196400 is a wasteful number, since it uses less digits than its factorization.

28196400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23518 (or 23507 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28196400 is about 5310.0282485124. The cubic root of 28196400 is about 304.3672270389.

The spelling of 28196400 in words is "twenty-eight million, one hundred ninety-six thousand, four hundred".