28211916 has 12 divisors (see below), whose sum is σ = 65827832. Its totient is φ = 9403968.

The previous prime is 28211893. The next prime is 28211923. The reversal of 28211916 is 61911282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1175485 + ... + 1175508.

Almost surely, 2^28211916 is an apocalyptic number.

It is an amenable number.

28211916 is an abundant number, since it is smaller than the sum of its proper divisors (37615916).

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

28211916 is a wasteful number, since it uses less digits than its factorization.

28211916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351000 (or 2350998 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 28211916 is about 5311.4890567524. The cubic root of 28211916 is about 304.4230461731.

The spelling of 28211916 in words is "twenty-eight million, two hundred eleven thousand, nine hundred sixteen".