28207636 has 12 divisors (see below), whose sum is σ = 49660128. Its totient is φ = 14019032.

The previous prime is 28207561. The next prime is 28207643. The reversal of 28207636 is 63670282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20446 + ... + 21781.

It is an arithmetic number, because the mean of its divisors is an integer number (4138344).

Almost surely, 2^28207636 is an apocalyptic number.

It is an amenable number.

28207636 is a deficient number, since it is larger than the sum of its proper divisors (21452492).

28207636 is a wasteful number, since it uses less digits than its factorization.

28207636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42398 (or 42396 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 28207636 is about 5311.0861412709. The cubic root of 28207636 is about 304.4076508282.

The spelling of 28207636 in words is "twenty-eight million, two hundred seven thousand, six hundred thirty-six".