28011916 has 6 divisors (see below), whose sum is σ = 49020860. Its totient is φ = 14005956.

The previous prime is 28011913. The next prime is 28011917. The reversal of 28011916 is 61911082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28011911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3501486 + ... + 3501493.

Almost surely, 2^28011916 is an apocalyptic number.

It is an amenable number.

28011916 is a deficient number, since it is larger than the sum of its proper divisors (21008944).

28011916 is a wasteful number, since it uses less digits than its factorization.

28011916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002983 (or 7002981 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 28011916 is about 5292.6284585261. The cubic root of 28011916 is about 303.7019672619.

Adding to 28011916 its reverse (61911082), we get a palindrome (89922998).

The spelling of 28011916 in words is "twenty-eight million, eleven thousand, nine hundred sixteen".