28077728 has 48 divisors (see below), whose sum is σ = 63645120. Its totient is φ = 11943936.

The previous prime is 28077719. The next prime is 28077767. The reversal of 28077728 is 82777082.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 36128 + ... + 36896.

It is an arithmetic number, because the mean of its divisors is an integer number (1325940).

Almost surely, 2^28077728 is an apocalyptic number.

28077728 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 28077728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31822560).

28077728 is an abundant number, since it is smaller than the sum of its proper divisors (35567392).

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

28077728 is a wasteful number, since it uses less digits than its factorization.

28077728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 28077728 is about 5298.8421376750. The cubic root of 28077728 is about 303.9396232819.

The spelling of 28077728 in words is "twenty-eight million, seventy-seven thousand, seven hundred twenty-eight".