28550665 has 32 divisors (see below), whose sum is σ = 40876416. Its totient is φ = 18869760.

The previous prime is 28550657. The next prime is 28550677. The reversal of 28550665 is 56605582.

It is not a de Polignac number, because 28550665 - 2³ = 28550657 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51922 + ... + 52468.

It is an arithmetic number, because the mean of its divisors is an integer number (1277388).

Almost surely, 2^28550665 is an apocalyptic number.

It is an amenable number.

28550665 is a deficient number, since it is larger than the sum of its proper divisors (12325751).

28550665 is a wasteful number, since it uses less digits than its factorization.

28550665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 72000, while the sum is 37.

The square root of 28550665 is about 5343.2822309887. The cubic root of 28550665 is about 305.6366349146.

The spelling of 28550665 in words is "twenty-eight million, five hundred fifty thousand, six hundred sixty-five".