28009968 has 60 divisors (see below), whose sum is σ = 84179880. Its totient is φ = 8002176.

The previous prime is 28009951. The next prime is 28009973. The reversal of 28009968 is 86990082.

It is a super-2 number, since 2×28009968² = 1569116614722048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3603 + ... + 8306.

It is an arithmetic number, because the mean of its divisors is an integer number (1402998).

Almost surely, 2^28009968 is an apocalyptic number.

28009968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28009968 is an abundant number, since it is smaller than the sum of its proper divisors (56169912).

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

28009968 is a wasteful number, since it uses less digits than its factorization.

28009968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11934 (or 11921 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 28009968 is about 5292.4444257829. Note that the first 4 decimals coincide. The cubic root of 28009968 is about 303.6949271015.

The spelling of 28009968 in words is "twenty-eight million, nine thousand, nine hundred sixty-eight".