28122660 has 96 divisors (see below), whose sum is σ = 92131200. Its totient is φ = 7102080.

The previous prime is 28122643. The next prime is 28122671. The reversal of 28122660 is 6622182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8890 + ... + 11630.

It is an arithmetic number, because the mean of its divisors is an integer number (959700).

Almost surely, 2^28122660 is an apocalyptic number.

28122660 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 28122660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46065600).

28122660 is an abundant number, since it is smaller than the sum of its proper divisors (64008540).

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

28122660 is a wasteful number, since it uses less digits than its factorization.

28122660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28122660 is about 5303.0802369943. The cubic root of 28122660 is about 304.1016655580.

It can be divided in two parts, 28122 and 660, that added together give a palindrome (28782).

The spelling of 28122660 in words is "twenty-eight million, one hundred twenty-two thousand, six hundred sixty".