28611560 has 16 divisors (see below), whose sum is σ = 64376100. Its totient is φ = 11444608.

The previous prime is 28611559. The next prime is 28611589. The reversal of 28611560 is 6511682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25421764 + 3189796 = 5042^2 + 1786^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357605 + ... + 357684.

Almost surely, 2^28611560 is an apocalyptic number.

28611560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28611560 is an abundant number, since it is smaller than the sum of its proper divisors (35764540).

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

28611560 is a wasteful number, since it uses less digits than its factorization.

28611560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715300 (or 715296 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28611560 is about 5348.9774723773. The cubic root of 28611560 is about 305.8537755237.

The spelling of 28611560 in words is "twenty-eight million, six hundred eleven thousand, five hundred sixty".