28655712 has 144 divisors (see below), whose sum is σ = 87272640. Its totient is φ = 8902656.

The previous prime is 28655681. The next prime is 28655713. The reversal of 28655712 is 21755682.

It is a happy number.

28655712 is a `hidden beast` number, since 2 + 86 + 5 + 571 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×28655712² = 1642299660453888, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28655713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392508 + ... + 392580.

It is an arithmetic number, because the mean of its divisors is an integer number (606060).

Almost surely, 2^28655712 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 28655712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43636320).

28655712 is an abundant number, since it is smaller than the sum of its proper divisors (58616928).

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

28655712 is a wasteful number, since it uses less digits than its factorization.

28655712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 154 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 28655712 is about 5353.1030253489. The cubic root of 28655712 is about 306.0110210051.

The spelling of 28655712 in words is "twenty-eight million, six hundred fifty-five thousand, seven hundred twelve".