28662786 has 36 divisors (see below), whose sum is σ = 64209366. Its totient is φ = 9240480.

The previous prime is 28662779. The next prime is 28662787. The reversal of 28662786 is 68726682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 26163225 + 2499561 = 5115^2 + 1581^2 .

It is a super-3 number, since 3×28662786³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28662787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16470 + ... + 18126.

Almost surely, 2^28662786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28662786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32104683).

28662786 is an abundant number, since it is smaller than the sum of its proper divisors (35546580).

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

28662786 is a wasteful number, since it uses less digits than its factorization.

28662786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727 (or 1693 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 28662786 is about 5353.7637228402. The cubic root of 28662786 is about 306.0361997415.

The spelling of 28662786 in words is "twenty-eight million, six hundred sixty-two thousand, seven hundred eighty-six".