28481866 has 32 divisors (see below), whose sum is σ = 51321600. Its totient is φ = 11590656.

The previous prime is 28481833. The next prime is 28481891. The reversal of 28481866 is 66818482.

It is a super-2 number, since 2×28481866² = 1622433381683912, which contains 22 as substring.

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, 63210 + ... + 63658.

It is an arithmetic number, because the mean of its divisors is an integer number (1603800).

Almost surely, 2^28481866 is an apocalyptic number.

28481866 is a deficient number, since it is larger than the sum of its proper divisors (22839734).

28481866 is a wasteful number, since it uses less digits than its factorization.

28481866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678.

The product of its digits is 147456, while the sum is 43.

The square root of 28481866 is about 5336.8404510534. The cubic root of 28481866 is about 305.3909382722.

The spelling of 28481866 in words is "twenty-eight million, four hundred eighty-one thousand, eight hundred sixty-six".