28666651 has 16 divisors (see below), whose sum is σ = 31682560. Its totient is φ = 25777440.

The previous prime is 28666643. The next prime is 28666721. The reversal of 28666651 is 15666682.

It is not a de Polignac number, because 28666651 - 2³ = 28666643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28666621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105646 + ... + 105916.

It is an arithmetic number, because the mean of its divisors is an integer number (1980160).

Almost surely, 2^28666651 is an apocalyptic number.

28666651 is a deficient number, since it is larger than the sum of its proper divisors (3015909).

28666651 is a wasteful number, since it uses less digits than its factorization.

28666651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466.

The product of its digits is 103680, while the sum is 40.

The square root of 28666651 is about 5354.1246716900. The cubic root of 28666651 is about 306.0499548216.

The spelling of 28666651 in words is "twenty-eight million, six hundred sixty-six thousand, six hundred fifty-one".