28668772 has 18 divisors (see below), whose sum is σ = 55146854. Its totient is φ = 13031040.

The previous prime is 28668763. The next prime is 28668803. The reversal of 28668772 is 27786682.

It can be written as a sum of positive squares in only one way, i.e., 20738916 + 7929856 = 4554^2 + 2816^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29133 + ... + 30100.

Almost surely, 2^28668772 is an apocalyptic number.

28668772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28668772 is a deficient number, since it is larger than the sum of its proper divisors (26478082).

28668772 is a wasteful number, since it uses less digits than its factorization.

28668772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59259 (or 59246 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The square root of 28668772 is about 5354.3227396189. The cubic root of 28668772 is about 306.0575026855.

The spelling of 28668772 in words is "twenty-eight million, six hundred sixty-eight thousand, seven hundred seventy-two".