28065890 has 8 divisors (see below), whose sum is σ = 50518620. Its totient is φ = 11226352.

The previous prime is 28065889. The next prime is 28065913. The reversal of 28065890 is 9856082.

It can be written as a sum of positive squares in 2 ways, for example, as 26450449 + 1615441 = 5143^2 + 1271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403285 + ... + 1403304.

Almost surely, 2^28065890 is an apocalyptic number.

28065890 is a deficient number, since it is larger than the sum of its proper divisors (22452730).

28065890 is a wasteful number, since it uses less digits than its factorization.

28065890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2806596.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 28065890 is about 5297.7249834245. The cubic root of 28065890 is about 303.8969020779.

The spelling of 28065890 in words is "twenty-eight million, sixty-five thousand, eight hundred ninety".