28697650 has 12 divisors (see below), whose sum is σ = 53377722. Its totient is φ = 11479040.

The previous prime is 28697623. The next prime is 28697651. The reversal of 28697650 is 5679682.

It can be written as a sum of positive squares in 3 ways, for example, as 25532809 + 3164841 = 5053^2 + 1779^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28697597 and 28697606.

It is not an unprimeable number, because it can be changed into a prime (28697651) 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 in 5 ways as a sum of consecutive naturals, for example, 286927 + ... + 287026.

Almost surely, 2^28697650 is an apocalyptic number.

28697650 is a deficient number, since it is larger than the sum of its proper divisors (24680072).

28697650 is a wasteful number, since it uses less digits than its factorization.

28697650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573965 (or 573960 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 28697650 is about 5357.0187604674. The cubic root of 28697650 is about 306.1602319155.

The spelling of 28697650 in words is "twenty-eight million, six hundred ninety-seven thousand, six hundred fifty".