28900066 has 16 divisors (see below), whose sum is σ = 48295800. Its totient is φ = 12878208.

The previous prime is 28900061. The next prime is 28900111. The reversal of 28900066 is 66000982.

It can be written as a sum of positive squares in 4 ways, for example, as 20025625 + 8874441 = 4475^2 + 2979^2 .

It is not an unprimeable number, because it can be changed into a prime (28900061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18411 + ... + 19918.

Almost surely, 2^28900066 is an apocalyptic number.

28900066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28900066 is a deficient number, since it is larger than the sum of its proper divisors (19395734).

28900066 is a wasteful number, since it uses less digits than its factorization.

28900066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38373.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28900066 is about 5375.8781608217. The cubic root of 28900066 is about 306.8783696258.

The spelling of 28900066 in words is "twenty-eight million, nine hundred thousand, sixty-six".