280121680 has 40 divisors (see below), whose sum is σ = 659145312. Its totient is φ = 110696064.

The previous prime is 280121663. The next prime is 280121713. The reversal of 280121680 is 86121082.

280121680 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

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, 14454 + ... + 27733.

Almost surely, 2^280121680 is an apocalyptic number.

280121680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280121680 is an abundant number, since it is smaller than the sum of its proper divisors (379023632).

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

280121680 is a wasteful number, since it uses less digits than its factorization.

280121680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42283 (or 42277 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 280121680 is about 16736.8360211839. The cubic root of 280121680 is about 654.3080157772.

It can be divided in two parts, 28012 and 1680, that added together give a palindrome (29692).

The spelling of 280121680 in words is "two hundred eighty million, one hundred twenty-one thousand, six hundred eighty".