28136560 has 20 divisors (see below), whose sum is σ = 65417688. Its totient is φ = 11254592.

The previous prime is 28136557. The next prime is 28136599. The reversal of 28136560 is 6563182.

It is a tau number, because it is divible by the number of its divisors (20).

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, 175774 + ... + 175933.

Almost surely, 2^28136560 is an apocalyptic number.

28136560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28136560 is an abundant number, since it is smaller than the sum of its proper divisors (37281128).

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

28136560 is a wasteful number, since it uses less digits than its factorization.

28136560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351720 (or 351714 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28136560 is about 5304.3906341822. The cubic root of 28136560 is about 304.1517594079.

The spelling of 28136560 in words is "twenty-eight million, one hundred thirty-six thousand, five hundred sixty".