28609960 has 16 divisors (see below), whose sum is σ = 64372500. Its totient is φ = 11443968.

The previous prime is 28609957. The next prime is 28609961. The reversal of 28609960 is 6990682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28451556 + 158404 = 5334^2 + 398^2 .

It is a super-2 number, since 2×28609960² = 1637059622403200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 715249 = 28609960 / (2 + 8 + 6 + 0 + 9 + 9 + 6 + 0).

It is not an unprimeable number, because it can be changed into a prime (28609961) 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, 357585 + ... + 357664.

Almost surely, 2^28609960 is an apocalyptic number.

28609960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28609960 is an abundant number, since it is smaller than the sum of its proper divisors (35762540).

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

28609960 is a wasteful number, since it uses less digits than its factorization.

28609960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715260 (or 715256 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 28609960 is about 5348.8279089909. The cubic root of 28609960 is about 305.8480741550.

The spelling of 28609960 in words is "twenty-eight million, six hundred nine thousand, nine hundred sixty".