28061668 has 6 divisors (see below), whose sum is σ = 49107926. Its totient is φ = 14030832.

The previous prime is 28061659. The next prime is 28061681. The reversal of 28061668 is 86616082.

It can be written as a sum of positive squares in only one way, i.e., 24029604 + 4032064 = 4902^2 + 2008^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3507705 + ... + 3507712.

Almost surely, 2^28061668 is an apocalyptic number.

It is an amenable number.

28061668 is a deficient number, since it is larger than the sum of its proper divisors (21046258).

28061668 is a wasteful number, since it uses less digits than its factorization.

28061668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7015421 (or 7015419 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28061668 is about 5297.3264955070. The cubic root of 28061668 is about 303.8816627362.

The spelling of 28061668 in words is "twenty-eight million, sixty-one thousand, six hundred sixty-eight".