28471660 has 48 divisors (see below), whose sum is σ = 69801984. Its totient is φ = 9551808.

The previous prime is 28471643. The next prime is 28471661. The reversal of 28471660 is 6617482.

It is not an unprimeable number, because it can be changed into a prime (28471661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4417 + ... + 8743.

It is an arithmetic number, because the mean of its divisors is an integer number (1454208).

Almost surely, 2^28471660 is an apocalyptic number.

28471660 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 28471660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34900992).

28471660 is an abundant number, since it is smaller than the sum of its proper divisors (41330324).

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

28471660 is a wasteful number, since it uses less digits than its factorization.

28471660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4390 (or 4388 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28471660 is about 5335.8841816516. The cubic root of 28471660 is about 305.3544566704.

The spelling of 28471660 in words is "twenty-eight million, four hundred seventy-one thousand, six hundred sixty".