28857144 has 32 divisors (see below), whose sum is σ = 72389520. Its totient is φ = 9586176.

The previous prime is 28857139. The next prime is 28857193. The reversal of 28857144 is 44175882.

It is a happy number.

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, 5712 + ... + 9504.

Almost surely, 2^28857144 is an apocalyptic number.

28857144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28857144 is an abundant number, since it is smaller than the sum of its proper divisors (43532376).

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

28857144 is a wasteful number, since it uses less digits than its factorization.

28857144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119 (or 4115 counting only the distinct ones).

The product of its digits is 71680, while the sum is 39.

The square root of 28857144 is about 5371.8845855063. The cubic root of 28857144 is about 306.7263704383.

The spelling of 28857144 in words is "twenty-eight million, eight hundred fifty-seven thousand, one hundred forty-four".