928681 has 4 divisors (see below), whose sum is σ = 1000132. Its totient is φ = 857232.

The previous prime is 928679. The next prime is 928699. The reversal of 928681 is 186829.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186829 = 23 ⋅8123.

It can be written as a sum of positive squares in 2 ways, for example, as 416025 + 512656 = 645^2 + 716^2 .

It is a cyclic number.

It is not a de Polignac number, because 928681 - 2¹ = 928679 is a prime.

It is a super-2 number, since 2×928681² = 1724896799522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (928621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35706 + ... + 35731.

It is an arithmetic number, because the mean of its divisors is an integer number (250033).

2⁹²⁸⁶⁸¹ is an apocalyptic number.

It is an amenable number.

928681 is a deficient number, since it is larger than the sum of its proper divisors (71451).

928681 is a wasteful number, since it uses less digits than its factorization.

928681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71450.

The product of its digits is 6912, while the sum is 34.

The square root of 928681 is about 963.6809638049. The cubic root of 928681 is about 97.5638328437.

The spelling of 928681 in words is "nine hundred twenty-eight thousand, six hundred eighty-one".