28119816 has 24 divisors (see below), whose sum is σ = 76158030. Its totient is φ = 9373248.

The previous prime is 28119811. The next prime is 28119827. The reversal of 28119816 is 61891182.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 2414916 = 5070^2 + 1554^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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 not an unprimeable number, because it can be changed into a prime (28119811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 195205 + ... + 195348.

Almost surely, 2^28119816 is an apocalyptic number.

It is an amenable number.

28119816 is an abundant number, since it is smaller than the sum of its proper divisors (48038214).

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

28119816 is a wasteful number, since it uses less digits than its factorization.

28119816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390565 (or 390558 counting only the distinct ones).

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

The square root of 28119816 is about 5302.8120841682. The cubic root of 28119816 is about 304.0914141060.

The spelling of 28119816 in words is "twenty-eight million, one hundred nineteen thousand, eight hundred sixteen".