280561128 has 32 divisors (see below), whose sum is σ = 706764960. Its totient is φ = 92805440.

The previous prime is 280561117. The next prime is 280561139. The reversal of 280561128 is 821165082.

It is an interprime number because it is at equal distance from previous prime (280561117) and next prime (280561139).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41475 + ... + 47762.

It is an arithmetic number, because the mean of its divisors is an integer number (22086405).

Almost surely, 2^280561128 is an apocalyptic number.

It is an amenable number.

280561128 is an abundant number, since it is smaller than the sum of its proper divisors (426203832).

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

280561128 is a wasteful number, since it uses less digits than its factorization.

280561128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89377 (or 89373 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 280561128 is about 16749.9590447260. The cubic root of 280561128 is about 654.6499911180.

The spelling of 280561128 in words is "two hundred eighty million, five hundred sixty-one thousand, one hundred twenty-eight".