28091632 has 10 divisors (see below), whose sum is σ = 54427568. Its totient is φ = 14045808.

The previous prime is 28091629. The next prime is 28091663. The reversal of 28091632 is 23619082.

It is a junction number, because it is equal to n+sod(n) for n = 28091594 and 28091603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 877848 + ... + 877879.

Almost surely, 2^28091632 is an apocalyptic number.

It is an amenable number.

28091632 is a deficient number, since it is larger than the sum of its proper divisors (26335936).

28091632 is a wasteful number, since it uses less digits than its factorization.

28091632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755735 (or 1755729 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 28091632 is about 5300.1539600280. The cubic root of 28091632 is about 303.9897849753.

The spelling of 28091632 in words is "twenty-eight million, ninety-one thousand, six hundred thirty-two".