28192681 has 16 divisors (see below), whose sum is σ = 32892480. Its totient is φ = 23879680.

The previous prime is 28192667. The next prime is 28192691. The reversal of 28192681 is 18629182.

It is a de Polignac number, because none of the positive numbers 2^k-28192681 is a prime.

It is a super-2 number, since 2×28192681² = 1589654523935522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28192681.

It is not an unprimeable number, because it can be changed into a prime (28192601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19305 + ... + 20713.

It is an arithmetic number, because the mean of its divisors is an integer number (2055780).

Almost surely, 2^28192681 is an apocalyptic number.

It is an amenable number.

28192681 is a deficient number, since it is larger than the sum of its proper divisors (4699799).

28192681 is a wasteful number, since it uses less digits than its factorization.

28192681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544.

The product of its digits is 13824, while the sum is 37.

The square root of 28192681 is about 5309.6780505036. The cubic root of 28192681 is about 304.3538448165.

The spelling of 28192681 in words is "twenty-eight million, one hundred ninety-two thousand, six hundred eighty-one".