280138641 has 16 divisors (see below), whose sum is σ = 394827840. Its totient is φ = 176186880.

The previous prime is 280138633. The next prime is 280138669. The reversal of 280138641 is 146831082.

It is not a de Polignac number, because 280138641 - 2³ = 280138633 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (280138681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3541 + ... + 23933.

It is an arithmetic number, because the mean of its divisors is an integer number (24676740).

Almost surely, 2^280138641 is an apocalyptic number.

It is an amenable number.

280138641 is a deficient number, since it is larger than the sum of its proper divisors (114689199).

280138641 is a wasteful number, since it uses less digits than its factorization.

280138641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20656.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 280138641 is about 16737.3427102393. The cubic root of 280138641 is about 654.3212213412.

The spelling of 280138641 in words is "two hundred eighty million, one hundred thirty-eight thousand, six hundred forty-one".