28681694 has 4 divisors (see below), whose sum is σ = 43022544. Its totient is φ = 14340846.

The previous prime is 28681693. The next prime is 28681699. The reversal of 28681694 is 49618682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28681691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7170422 + ... + 7170425.

It is an arithmetic number, because the mean of its divisors is an integer number (10755636).

Almost surely, 2^28681694 is an apocalyptic number.

28681694 is a deficient number, since it is larger than the sum of its proper divisors (14340850).

28681694 is a wasteful number, since it uses less digits than its factorization.

28681694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14340849.

The product of its digits is 165888, while the sum is 44.

The square root of 28681694 is about 5355.5292922362. The cubic root of 28681694 is about 306.1034793205.

The spelling of 28681694 in words is "twenty-eight million, six hundred eighty-one thousand, six hundred ninety-four".