28642356 has 24 divisors (see below), whose sum is σ = 74258240. Its totient is φ = 9547416.

The previous prime is 28642351. The next prime is 28642373. The reversal of 28642356 is 65324682.

28642356 is a `hidden beast` number, since 2 + 8 + 642 + 3 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28642356.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28642351) 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 7 ways as a sum of consecutive naturals, for example, 132496 + ... + 132711.

Almost surely, 2^28642356 is an apocalyptic number.

It is an amenable number.

28642356 is an abundant number, since it is smaller than the sum of its proper divisors (45615884).

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

28642356 is a wasteful number, since it uses less digits than its factorization.

28642356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265220 (or 265212 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 28642356 is about 5351.8553792120. The cubic root of 28642356 is about 305.9634712259.

The spelling of 28642356 in words is "twenty-eight million, six hundred forty-two thousand, three hundred fifty-six".