28291872 has 48 divisors (see below), whose sum is σ = 84877632. Its totient is φ = 8083200.

The previous prime is 28291843. The next prime is 28291873. The reversal of 28291872 is 27819282.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 28291872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28291873) 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 7 ways as a sum of consecutive naturals, for example, 20379 + ... + 21722.

It is an arithmetic number, because the mean of its divisors is an integer number (1768284).

Almost surely, 2^28291872 is an apocalyptic number.

It is an amenable number.

28291872 is an abundant number, since it is smaller than the sum of its proper divisors (56585760).

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

28291872 is a wasteful number, since it uses less digits than its factorization.

28291872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42121 (or 42113 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 28291872 is about 5319.0104342819. The cubic root of 28291872 is about 304.7103655529.

The spelling of 28291872 in words is "twenty-eight million, two hundred ninety-one thousand, eight hundred seventy-two".