28311560 has 16 divisors (see below), whose sum is σ = 63701100. Its totient is φ = 11324608.

The previous prime is 28311557. The next prime is 28311571. The reversal of 28311560 is 6511382.

It can be written as a sum of positive squares in 2 ways, for example, as 27857284 + 454276 = 5278^2 + 674^2 .

It is a super-3 number, since 3×28311560³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353855 + ... + 353934.

Almost surely, 2^28311560 is an apocalyptic number.

28311560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28311560 is an abundant number, since it is smaller than the sum of its proper divisors (35389540).

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

28311560 is a wasteful number, since it uses less digits than its factorization.

28311560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707800 (or 707796 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 28311560 is about 5320.8608326097. The cubic root of 28311560 is about 304.7810306852.

The spelling of 28311560 in words is "twenty-eight million, three hundred eleven thousand, five hundred sixty".