28257700 has 18 divisors (see below), whose sum is σ = 61319426. Its totient is φ = 11303040.

The previous prime is 28257659. The next prime is 28257707. The reversal of 28257700 is 775282.

It can be written as a sum of positive squares in 3 ways, for example, as 2795584 + 25462116 = 1672^2 + 5046^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 141189 + ... + 141388.

Almost surely, 2^28257700 is an apocalyptic number.

28257700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28257700 is an abundant number, since it is smaller than the sum of its proper divisors (33061726).

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

28257700 is a wasteful number, since it uses less digits than its factorization.

28257700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282591 (or 282584 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 28257700 is about 5315.7972120840. The cubic root of 28257700 is about 304.5876358674.

The spelling of 28257700 in words is "twenty-eight million, two hundred fifty-seven thousand, seven hundred".