280645389132 has 12 divisors (see below), whose sum is σ = 654839241336. Its totient is φ = 93548463040.

The previous prime is 280645389103. The next prime is 280645389133. The reversal of 280645389132 is 231983546082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (280645389133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11693557869 + ... + 11693557892.

It is an arithmetic number, because the mean of its divisors is an integer number (54569936778).

Almost surely, 2^280645389132 is an apocalyptic number.

It is an amenable number.

280645389132 is an abundant number, since it is smaller than the sum of its proper divisors (374193852204).

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

280645389132 is a wasteful number, since it uses less digits than its factorization.

280645389132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23387115768 (or 23387115766 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 280645389132 in words is "two hundred eighty billion, six hundred forty-five million, three hundred eighty-nine thousand, one hundred thirty-two".