28891560 has 32 divisors (see below), whose sum is σ = 86675040. Its totient is φ = 7704384.

The previous prime is 28891559. The next prime is 28891573. The reversal of 28891560 is 6519882.

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 7 ways as a sum of consecutive naturals, for example, 120262 + ... + 120501.

It is an arithmetic number, because the mean of its divisors is an integer number (2708595).

Almost surely, 2^28891560 is an apocalyptic number.

28891560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28891560 is an abundant number, since it is smaller than the sum of its proper divisors (57783480).

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

28891560 is a wasteful number, since it uses less digits than its factorization.

28891560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240777 (or 240773 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28891560 is about 5375.0869760405. The cubic root of 28891560 is about 306.8482593883.

The spelling of 28891560 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred sixty".