28857500 has 120 divisors (see below), whose sum is σ = 77150304. Its totient is φ = 9216000.

The previous prime is 28857487. The next prime is 28857509. The reversal of 28857500 is 575882.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857509) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 297452 + ... + 297548.

Almost surely, 2^28857500 is an apocalyptic number.

28857500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28857500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38575152).

28857500 is an abundant number, since it is smaller than the sum of its proper divisors (48292804).

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

28857500 is a wasteful number, since it uses less digits than its factorization.

28857500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 28857500 is about 5371.9177208889. The cubic root of 28857500 is about 306.7276317567.

It can be divided in two parts, 28 and 857500, that multiplied together give a 4-th power (24010000 = 70⁴).

The spelling of 28857500 in words is "twenty-eight million, eight hundred fifty-seven thousand, five hundred".