28030688 has 72 divisors (see below), whose sum is σ = 67151952. Its totient is φ = 11280384.

The previous prime is 28030679. The next prime is 28030697. The reversal of 28030688 is 88603082.

It is an interprime number because it is at equal distance from previous prime (28030679) and next prime (28030697).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64520 + ... + 64952.

It is an arithmetic number, because the mean of its divisors is an integer number (932666).

Almost surely, 2^28030688 is an apocalyptic number.

28030688 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 28030688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33575976).

28030688 is an abundant number, since it is smaller than the sum of its proper divisors (39121264).

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

28030688 is a wasteful number, since it uses less digits than its factorization.

28030688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 28030688 is about 5294.4015714715. The cubic root of 28030688 is about 303.7697934005.

The spelling of 28030688 in words is "twenty-eight million, thirty thousand, six hundred eighty-eight".