28011668 has 6 divisors (see below), whose sum is σ = 49020426. Its totient is φ = 14005832.

The previous prime is 28011647. The next prime is 28011673. The reversal of 28011668 is 86611082.

It can be written as a sum of positive squares in only one way, i.e., 24581764 + 3429904 = 4958^2 + 1852^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3501455 + ... + 3501462.

It is an arithmetic number, because the mean of its divisors is an integer number (8170071).

Almost surely, 2^28011668 is an apocalyptic number.

It is an amenable number.

28011668 is a deficient number, since it is larger than the sum of its proper divisors (21008758).

28011668 is a wasteful number, since it uses less digits than its factorization.

28011668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7002921 (or 7002919 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 28011668 is about 5292.6050296617. The cubic root of 28011668 is about 303.7010709968.

The spelling of 28011668 in words is "twenty-eight million, eleven thousand, six hundred sixty-eight".