28725768 has 24 divisors (see below), whose sum is σ = 77799150. Its totient is φ = 9575232.

The previous prime is 28725761. The next prime is 28725779. The reversal of 28725768 is 86752782.

28725768 is a `hidden beast` number, since 2 + 8 + 72 + 576 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23444964 + 5280804 = 4842^2 + 2298^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (28725761) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199413 + ... + 199556.

Almost surely, 2^28725768 is an apocalyptic number.

It is an amenable number.

28725768 is an abundant number, since it is smaller than the sum of its proper divisors (49073382).

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

28725768 is a wasteful number, since it uses less digits than its factorization.

28725768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398981 (or 398974 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 28725768 is about 5359.6425253929. The cubic root of 28725768 is about 306.2601913588.

The spelling of 28725768 in words is "twenty-eight million, seven hundred twenty-five thousand, seven hundred sixty-eight".