28655616 has 120 divisors (see below), whose sum is σ = 84932064. Its totient is φ = 8519680.

The previous prime is 28655611. The next prime is 28655617. The reversal of 28655616 is 61655682.

It is a super-2 number, since 2×28655616² = 1642288656678912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540646 + ... + 540698.

Almost surely, 2^28655616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28655616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42466032).

28655616 is an abundant number, since it is smaller than the sum of its proper divisors (56276448).

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

28655616 is an equidigital number, since it uses as much as digits as its factorization.

28655616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 69 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 28655616 is about 5353.0940585796. The cubic root of 28655616 is about 306.0106792804.

The spelling of 28655616 in words is "twenty-eight million, six hundred fifty-five thousand, six hundred sixteen".