28517730 has 32 divisors (see below), whose sum is σ = 70804800. Its totient is φ = 7342272.

The previous prime is 28517707. The next prime is 28517777. The reversal of 28517730 is 3771582.

It is a junction number, because it is equal to n+sod(n) for n = 28517691 and 28517700.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15520 + ... + 17259.

It is an arithmetic number, because the mean of its divisors is an integer number (2212650).

Almost surely, 2^28517730 is an apocalyptic number.

28517730 is an abundant number, since it is smaller than the sum of its proper divisors (42287070).

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

28517730 is a wasteful number, since it uses less digits than its factorization.

28517730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32818.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 28517730 is about 5340.1994344781. The cubic root of 28517730 is about 305.5190659578.

The spelling of 28517730 in words is "twenty-eight million, five hundred seventeen thousand, seven hundred thirty".