27281020 has 48 divisors (see below), whose sum is σ = 62078688. Its totient is φ = 10010880.

The previous prime is 27281003. The next prime is 27281027. The reversal of 27281020 is 2018272.

It is a junction number, because it is equal to n+sod(n) for n = 27280982 and 27281000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27281027) 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 15 ways as a sum of consecutive naturals, for example, 82255 + ... + 82585.

It is an arithmetic number, because the mean of its divisors is an integer number (1293306).

Almost surely, 2^27281020 is an apocalyptic number.

27281020 is a gapful number since it is divisible by the number (20) 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 27281020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31039344).

27281020 is an abundant number, since it is smaller than the sum of its proper divisors (34797668).

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

27281020 is a wasteful number, since it uses less digits than its factorization.

27281020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 27281020 is about 5223.1235865141. The cubic root of 27281020 is about 301.0372245659.

Adding to 27281020 its reverse (2018272), we get a palindrome (29299292).

The spelling of 27281020 in words is "twenty-seven million, two hundred eighty-one thousand, twenty".