28065400 has 48 divisors (see below), whose sum is σ = 71189640. Its totient is φ = 10204800.

The previous prime is 28065391. The next prime is 28065403. The reversal of 28065400 is 456082.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28065403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4179 + ... + 8578.

Almost surely, 2^28065400 is an apocalyptic number.

28065400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28065400 is an abundant number, since it is smaller than the sum of its proper divisors (43124240).

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

28065400 is a wasteful number, since it uses less digits than its factorization.

28065400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12784 (or 12775 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28065400 is about 5297.6787369564. The cubic root of 28065400 is about 303.8951334975.

The spelling of 28065400 in words is "twenty-eight million, sixty-five thousand, four hundred".