28005776 has 10 divisors (see below), whose sum is σ = 54261222. Its totient is φ = 14002880.

The previous prime is 28005773. The next prime is 28005787. The reversal of 28005776 is 67750082.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 13868176 = 3760^2 + 3724^2 .

It is not an unprimeable number, because it can be changed into a prime (28005773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 875165 + ... + 875196.

Almost surely, 2^28005776 is an apocalyptic number.

It is an amenable number.

28005776 is a deficient number, since it is larger than the sum of its proper divisors (26255446).

28005776 is a wasteful number, since it uses less digits than its factorization.

28005776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750369 (or 1750363 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 28005776 is about 5292.0483746844. The cubic root of 28005776 is about 303.6797759161.

The spelling of 28005776 in words is "twenty-eight million, five thousand, seven hundred seventy-six".