28857140 has 24 divisors (see below), whose sum is σ = 65262120. Its totient is φ = 10654848.

The previous prime is 28857139. The next prime is 28857193. The reversal of 28857140 is 4175882.

It can be written as a sum of positive squares in 4 ways, for example, as 6370576 + 22486564 = 2524^2 + 4742^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28857140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55235 + ... + 55754.

It is an arithmetic number, because the mean of its divisors is an integer number (2719255).

Almost surely, 2^28857140 is an apocalyptic number.

28857140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28857140 is an abundant number, since it is smaller than the sum of its proper divisors (36404980).

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

28857140 is a wasteful number, since it uses less digits than its factorization.

28857140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111011 (or 111009 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28857140 is about 5371.8842131975. The cubic root of 28857140 is about 306.7263562662.

The spelling of 28857140 in words is "twenty-eight million, eight hundred fifty-seven thousand, one hundred forty".