27128556 has 144 divisors (see below), whose sum is σ = 86632000. Its totient is φ = 7154784.

The previous prime is 27128551. The next prime is 27128567. The reversal of 27128556 is 65582172.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

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

Its product of digits (33600) is a multiple of the sum of its prime divisors (25).

It is a self number, because there is not a number n which added to its sum of digits gives 27128556.

It is not an unprimeable number, because it can be changed into a prime (27128551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2086806 + ... + 2086818.

Almost surely, 2^27128556 is an apocalyptic number.

27128556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27128556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43316000).

27128556 is an abundant number, since it is smaller than the sum of its proper divisors (59503444).

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

27128556 is a wasteful number, since it uses less digits than its factorization.

27128556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 25 counting only the distinct ones).

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

The square root of 27128556 is about 5208.5080397365. The cubic root of 27128556 is about 300.4753796494.

27128556 divided by its sum of digits (36) gives a cube (753571 = 91³).

The spelling of 27128556 in words is "twenty-seven million, one hundred twenty-eight thousand, five hundred fifty-six".