28683657 has 6 divisors (see below), whose sum is σ = 41431962. Its totient is φ = 19122432.

The previous prime is 28683601. The next prime is 28683659. The reversal of 28683657 is 75638682.

28683657 is a `hidden beast` number, since 286 + 8 + 365 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28259856 + 423801 = 5316^2 + 651^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28683657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28683659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1593528 + ... + 1593545.

It is an arithmetic number, because the mean of its divisors is an integer number (6905327).

Almost surely, 2^28683657 is an apocalyptic number.

It is an amenable number.

28683657 is a deficient number, since it is larger than the sum of its proper divisors (12748305).

28683657 is a wasteful number, since it uses less digits than its factorization.

28683657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187079 (or 3187076 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28683657 is about 5355.7125576341. The cubic root of 28683657 is about 306.1104624904.

The spelling of 28683657 in words is "twenty-eight million, six hundred eighty-three thousand, six hundred fifty-seven".