28641668 has 54 divisors (see below), whose sum is σ = 59340078. Its totient is φ = 12045440.

The previous prime is 28641649. The next prime is 28641731. The reversal of 28641668 is 86614682.

It can be written as a sum of positive squares in only one way, i.e., 26956864 + 1684804 = 5192^2 + 1298^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 485423 + ... + 485481.

Almost surely, 2^28641668 is an apocalyptic number.

It is an amenable number.

28641668 is an abundant number, since it is smaller than the sum of its proper divisors (30698410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28641668 is a wasteful number, since it uses less digits than its factorization.

28641668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 89 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 28641668 is about 5351.7911020517. The cubic root of 28641668 is about 305.9610214209.

The spelling of 28641668 in words is "twenty-eight million, six hundred forty-one thousand, six hundred sixty-eight".