28309776 has 40 divisors (see below), whose sum is σ = 79783584. Its totient is φ = 8578560.

The previous prime is 28309747. The next prime is 28309783. The reversal of 28309776 is 67790382.

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, 26281 + ... + 27336.

Almost surely, 2^28309776 is an apocalyptic number.

It is an amenable number.

28309776 is an abundant number, since it is smaller than the sum of its proper divisors (51473808).

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

28309776 is a wasteful number, since it uses less digits than its factorization.

28309776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53639 (or 53633 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 28309776 is about 5320.6931879220. The cubic root of 28309776 is about 304.7746288152.

The spelling of 28309776 in words is "twenty-eight million, three hundred nine thousand, seven hundred seventy-six".