28471968 has 144 divisors (see below), whose sum is σ = 95921280. Its totient is φ = 7838208.

The previous prime is 28471967. The next prime is 28471969. The reversal of 28471968 is 86917482.

It is an interprime number because it is at equal distance from previous prime (28471967) and next prime (28471969).

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28471967) 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 23 ways as a sum of consecutive naturals, for example, 58221 + ... + 58707.

It is an arithmetic number, because the mean of its divisors is an integer number (666120).

Almost surely, 2^28471968 is an apocalyptic number.

28471968 is a gapful number since it is divisible by the number (28) 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 28471968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47960640).

28471968 is an abundant number, since it is smaller than the sum of its proper divisors (67449312).

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

28471968 is a wasteful number, since it uses less digits than its factorization.

28471968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 528 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28471968 is about 5335.9130427697. The cubic root of 28471968 is about 305.3555577517.

The spelling of 28471968 in words is "twenty-eight million, four hundred seventy-one thousand, nine hundred sixty-eight".