28576638 has 40 divisors (see below), whose sum is σ = 64338120. Its totient is φ = 9480240.

The previous prime is 28576621. The next prime is 28576663. The reversal of 28576638 is 83667582.

28576638 is a `hidden beast` number, since 2 + 8 + 5 + 7 + 6 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28576593 and 28576602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 67668 + ... + 68088.

It is an arithmetic number, because the mean of its divisors is an integer number (1608453).

Almost surely, 2^28576638 is an apocalyptic number.

28576638 is an abundant number, since it is smaller than the sum of its proper divisors (35761482).

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

28576638 is a wasteful number, since it uses less digits than its factorization.

28576638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 845 counting only the distinct ones).

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

The square root of 28576638 is about 5345.7121134607. The cubic root of 28576638 is about 305.7292876816.

The spelling of 28576638 in words is "twenty-eight million, five hundred seventy-six thousand, six hundred thirty-eight".