28211869 has 8 divisors (see below), whose sum is σ = 33644160. Its totient is φ = 23130096.

The previous prime is 28211861. The next prime is 28211879. The reversal of 28211869 is 96811282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28211869 - 2³ = 28211861 is a prime.

It is a super-2 number, since 2×28211869² = 1591819104946322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87454 + ... + 87775.

It is an arithmetic number, because the mean of its divisors is an integer number (4205520).

Almost surely, 2^28211869 is an apocalyptic number.

It is an amenable number.

28211869 is a deficient number, since it is larger than the sum of its proper divisors (5432291).

28211869 is a wasteful number, since it uses less digits than its factorization.

28211869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175259.

The product of its digits is 13824, while the sum is 37.

The square root of 28211869 is about 5311.4846323792. The cubic root of 28211869 is about 304.4228771206.

The spelling of 28211869 in words is "twenty-eight million, two hundred eleven thousand, eight hundred sixty-nine".