28857880 has 32 divisors (see below), whose sum is σ = 66000240. Its totient is φ = 11352960.

The previous prime is 28857877. The next prime is 28857883. The reversal of 28857880 is 8875882.

It is an interprime number because it is at equal distance from previous prime (28857877) and next prime (28857883).

It is a self number, because there is not a number n which added to its sum of digits gives 28857880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3474 + ... + 8353.

Almost surely, 2^28857880 is an apocalyptic number.

28857880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28857880 is an abundant number, since it is smaller than the sum of its proper divisors (37142360).

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

28857880 is a wasteful number, since it uses less digits than its factorization.

28857880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11899 (or 11895 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 28857880 is about 5371.9530898920. The cubic root of 28857880 is about 306.7289780964.

The spelling of 28857880 in words is "twenty-eight million, eight hundred fifty-seven thousand, eight hundred eighty".