28257100 has 18 divisors (see below), whose sum is σ = 61318124. Its totient is φ = 11302800.

The previous prime is 28257067. The next prime is 28257121. The reversal of 28257100 is 175282.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141186 + ... + 141385.

Almost surely, 2^28257100 is an apocalyptic number.

28257100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28257100 is an abundant number, since it is smaller than the sum of its proper divisors (33061024).

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

28257100 is a wasteful number, since it uses less digits than its factorization.

28257100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282585 (or 282578 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 28257100 is about 5315.7407762230. The cubic root of 28257100 is about 304.5854800671.

The spelling of 28257100 in words is "twenty-eight million, two hundred fifty-seven thousand, one hundred".