28507776 has 128 divisors (see below), whose sum is σ = 87687360. Its totient is φ = 8110080.

The previous prime is 28507757. The next prime is 28507789. The reversal of 28507776 is 67770582.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71610 + ... + 72006.

Almost surely, 2^28507776 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 28507776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43843680).

28507776 is an abundant number, since it is smaller than the sum of its proper divisors (59179584).

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

28507776 is a wasteful number, since it uses less digits than its factorization.

28507776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 42.

The square root of 28507776 is about 5339.2673654725. The cubic root of 28507776 is about 305.4835150838.

The spelling of 28507776 in words is "twenty-eight million, five hundred seven thousand, seven hundred seventy-six".