28661672 has 16 divisors (see below), whose sum is σ = 57874740. Its totient is φ = 13228416.

The previous prime is 28661663. The next prime is 28661683. The reversal of 28661672 is 27616682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25542916 + 3118756 = 5054^2 + 1766^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137693 + ... + 137900.

Almost surely, 2^28661672 is an apocalyptic number.

It is an amenable number.

28661672 is an abundant number, since it is smaller than the sum of its proper divisors (29213068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28661672 is a wasteful number, since it uses less digits than its factorization.

28661672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275612 (or 275608 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 28661672 is about 5353.6596828711. The cubic root of 28661672 is about 306.0322349171.

The spelling of 28661672 in words is "twenty-eight million, six hundred sixty-one thousand, six hundred seventy-two".