28211864 has 8 divisors (see below), whose sum is σ = 52897260. Its totient is φ = 14105928.

The previous prime is 28211861. The next prime is 28211879. The reversal of 28211864 is 46811282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28211864.

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 as a sum of consecutive naturals, namely, 1763234 + ... + 1763249.

Almost surely, 2^28211864 is an apocalyptic number.

It is an amenable number.

28211864 is a deficient number, since it is larger than the sum of its proper divisors (24685396).

28211864 is a wasteful number, since it uses less digits than its factorization.

28211864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526489 (or 3526485 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 28211864 is about 5311.4841617009. The cubic root of 28211864 is about 304.4228591362.

The spelling of 28211864 in words is "twenty-eight million, two hundred eleven thousand, eight hundred sixty-four".