28111968 has 48 divisors (see below), whose sum is σ = 81995760. Its totient is φ = 9370368.

The previous prime is 28111961. The next prime is 28111973. The reversal of 28111968 is 86911182.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28111961) 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, 15405 + ... + 17132.

It is an arithmetic number, because the mean of its divisors is an integer number (1708245).

Almost surely, 2^28111968 is an apocalyptic number.

It is an amenable number.

28111968 is an abundant number, since it is smaller than the sum of its proper divisors (53883792).

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

28111968 is a wasteful number, since it uses less digits than its factorization.

28111968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32556 (or 32542 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 28111968 is about 5302.0720477941. The cubic root of 28111968 is about 304.0631217034.

The spelling of 28111968 in words is "twenty-eight million, one hundred eleven thousand, nine hundred sixty-eight".