28747888 has 40 divisors (see below), whose sum is σ = 61464816. Its totient is φ = 12940800.

The previous prime is 28747843. The next prime is 28747913. The reversal of 28747888 is 88874782.

It is a Harshad number since it is a multiple of its sum of digits (52).

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, 6843 + ... + 10213.

Almost surely, 2^28747888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28747888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30732408).

28747888 is an abundant number, since it is smaller than the sum of its proper divisors (32716928).

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

28747888 is a wasteful number, since it uses less digits than its factorization.

28747888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433 (or 3427 counting only the distinct ones).

The product of its digits is 1605632, while the sum is 52.

The square root of 28747888 is about 5361.7056987492. The cubic root of 28747888 is about 306.3387820896.

The spelling of 28747888 in words is "twenty-eight million, seven hundred forty-seven thousand, eight hundred eighty-eight".