28701688 has 8 divisors (see below), whose sum is σ = 53815680. Its totient is φ = 14350840.

The previous prime is 28701667. The next prime is 28701703. The reversal of 28701688 is 88610782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28701688.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1793848 + ... + 1793863.

It is an arithmetic number, because the mean of its divisors is an integer number (6726960).

Almost surely, 2^28701688 is an apocalyptic number.

It is an amenable number.

28701688 is a deficient number, since it is larger than the sum of its proper divisors (25113992).

28701688 is a wasteful number, since it uses less digits than its factorization.

28701688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587717 (or 3587713 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28701688 is about 5357.3956359410. The cubic root of 28701688 is about 306.1745910127.

The spelling of 28701688 in words is "twenty-eight million, seven hundred one thousand, six hundred eighty-eight".