28657888 has 48 divisors (see below), whose sum is σ = 66576384. Its totient is φ = 11882880.

The previous prime is 28657879. The next prime is 28657897. The reversal of 28657888 is 88875682.

It is an interprime number because it is at equal distance from previous prime (28657879) and next prime (28657897).

It is a congruent number.

It is an unprimeable number.

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, 4881 + ... + 9007.

It is an arithmetic number, because the mean of its divisors is an integer number (1387008).

Almost surely, 2^28657888 is an apocalyptic number.

28657888 is a gapful number since it is divisible by the number (28) 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 28657888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33288192).

28657888 is an abundant number, since it is smaller than the sum of its proper divisors (37918496).

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

28657888 is a wasteful number, since it uses less digits than its factorization.

28657888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175 (or 4167 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 52.

The square root of 28657888 is about 5353.3062680926. The cubic root of 28657888 is about 306.0187665595.

The spelling of 28657888 in words is "twenty-eight million, six hundred fifty-seven thousand, eight hundred eighty-eight".