28661995 has 8 divisors (see below), whose sum is σ = 34665984. Its totient is φ = 22748544.

The previous prime is 28661981. The next prime is 28661999. The reversal of 28661995 is 59916682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28661995 - 2¹³ = 28653803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28661999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21934 + ... + 23203.

It is an arithmetic number, because the mean of its divisors is an integer number (4333248).

Almost surely, 2^28661995 is an apocalyptic number.

28661995 is a deficient number, since it is larger than the sum of its proper divisors (6003989).

28661995 is a wasteful number, since it uses less digits than its factorization.

28661995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45269.

The product of its digits is 233280, while the sum is 46.

The square root of 28661995 is about 5353.6898490667. The cubic root of 28661995 is about 306.0333845132.

The spelling of 28661995 in words is "twenty-eight million, six hundred sixty-one thousand, nine hundred ninety-five".