28765672 has 16 divisors (see below), whose sum is σ = 58084740. Its totient is φ = 13276416.

The previous prime is 28765669. The next prime is 28765673. The reversal of 28765672 is 27656782.

It can be written as a sum of positive squares in 2 ways, for example, as 28238596 + 527076 = 5314^2 + 726^2 .

It is a super-3 number, since 3×28765672³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28765673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138193 + ... + 138400.

Almost surely, 2^28765672 is an apocalyptic number.

It is an amenable number.

28765672 is an abundant number, since it is smaller than the sum of its proper divisors (29319068).

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

28765672 is a wasteful number, since it uses less digits than its factorization.

28765672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276612 (or 276608 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The square root of 28765672 is about 5363.3638698116. The cubic root of 28765672 is about 306.4019381017.

The spelling of 28765672 in words is "twenty-eight million, seven hundred sixty-five thousand, six hundred seventy-two".