28661983 has 16 divisors (see below), whose sum is σ = 35023104. Its totient is φ = 22896000.

The previous prime is 28661981. The next prime is 28661999. The reversal of 28661983 is 38916682.

It is a cyclic number.

It is not a de Polignac number, because 28661983 - 2¹ = 28661981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661981) 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, 11608 + ... + 13858.

It is an arithmetic number, because the mean of its divisors is an integer number (2188944).

Almost surely, 2^28661983 is an apocalyptic number.

28661983 is a deficient number, since it is larger than the sum of its proper divisors (6361121).

28661983 is a wasteful number, since it uses less digits than its factorization.

28661983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382.

The product of its digits is 124416, while the sum is 43.

The square root of 28661983 is about 5353.6887283442. The cubic root of 28661983 is about 306.0333418039.

The spelling of 28661983 in words is "twenty-eight million, six hundred sixty-one thousand, nine hundred eighty-three".