28697992 has 8 divisors (see below), whose sum is σ = 53808750. Its totient is φ = 14348992.

The previous prime is 28697959. The next prime is 28697993. The reversal of 28697992 is 29979682.

It can be written as a sum of positive squares in only one way, i.e., 25260676 + 3437316 = 5026^2 + 1854^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28697993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1793617 + ... + 1793632.

Almost surely, 2^28697992 is an apocalyptic number.

It is an amenable number.

28697992 is a deficient number, since it is larger than the sum of its proper divisors (25110758).

28697992 is a wasteful number, since it uses less digits than its factorization.

28697992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587255 (or 3587251 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 28697992 is about 5357.0506811118. The cubic root of 28697992 is about 306.1614481171.

The spelling of 28697992 in words is "twenty-eight million, six hundred ninety-seven thousand, nine hundred ninety-two".