280640515128 has 32 divisors (see below), whose sum is σ = 701823292800. Its totient is φ = 93517237728.

The previous prime is 280640515087. The next prime is 280640515219. The reversal of 280640515128 is 821515046082.

It is a self number, because there is not a number n which added to its sum of digits gives 280640515128.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1772548 + ... + 1924371.

It is an arithmetic number, because the mean of its divisors is an integer number (21931977900).

Almost surely, 2^280640515128 is an apocalyptic number.

It is an amenable number.

280640515128 is an abundant number, since it is smaller than the sum of its proper divisors (421182777672).

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

280640515128 is a wasteful number, since it uses less digits than its factorization.

280640515128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700091 (or 3700087 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 280640515128 in words is "two hundred eighty billion, six hundred forty million, five hundred fifteen thousand, one hundred twenty-eight".