281628560 has 40 divisors (see below), whose sum is σ = 683259840. Its totient is φ = 107752832.

The previous prime is 281628527. The next prime is 281628569. The reversal of 281628560 is 65826182.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (281628569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74690 + ... + 78369.

It is an arithmetic number, because the mean of its divisors is an integer number (17081496).

Almost surely, 2^281628560 is an apocalyptic number.

281628560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281628560 is an abundant number, since it is smaller than the sum of its proper divisors (401631280).

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

281628560 is a wasteful number, since it uses less digits than its factorization.

281628560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153095 (or 153089 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 281628560 is about 16781.7925145081. The cubic root of 281628560 is about 655.4791746476.

The spelling of 281628560 in words is "two hundred eighty-one million, six hundred twenty-eight thousand, five hundred sixty".