28697634 has 36 divisors (see below), whose sum is σ = 72331974. Its totient is φ = 8199072.

The previous prime is 28697623. The next prime is 28697651. The reversal of 28697634 is 43679682.

28697634 is a `hidden beast` number, since 2 + 8 + 6 + 9 + 7 + 634 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28676025 + 21609 = 5355^2 + 147^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28697634.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15387 + ... + 17150.

Almost surely, 2^28697634 is an apocalyptic number.

28697634 is an abundant number, since it is smaller than the sum of its proper divisors (43634340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28697634 is a wasteful number, since it uses less digits than its factorization.

28697634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32559 (or 32549 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 28697634 is about 5357.0172670993. The cubic root of 28697634 is about 306.1601750169.

The spelling of 28697634 in words is "twenty-eight million, six hundred ninety-seven thousand, six hundred thirty-four".