28959866 has 16 divisors (see below), whose sum is σ = 47200104. Its totient is φ = 13246464.

The previous prime is 28959841. The next prime is 28959877. The reversal of 28959866 is 66895982.

28959866 = 351² + 352² + ... + 506².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8970025 + 19989841 = 2995^2 + 4471^2 .

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, 1991 + ... + 7866.

Almost surely, 2^28959866 is an apocalyptic number.

28959866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28959866 is a deficient number, since it is larger than the sum of its proper divisors (18240238).

28959866 is a wasteful number, since it uses less digits than its factorization.

28959866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9985.

The product of its digits is 1866240, while the sum is 53.

The square root of 28959866 is about 5381.4371686381. The cubic root of 28959866 is about 307.0898879837.

The spelling of 28959866 in words is "twenty-eight million, nine hundred fifty-nine thousand, eight hundred sixty-six".