280887601 has 4 divisors (see below), whose sum is σ = 282676852. Its totient is φ = 279098352.

The previous prime is 280887589. The next prime is 280887611. The reversal of 280887601 is 106788082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106788082 = 2 ⋅53394041.

It can be written as a sum of positive squares in 2 ways, for example, as 74218225 + 206669376 = 8615^2 + 14376^2 .

It is a cyclic number.

It is not a de Polignac number, because 280887601 - 2⁷ = 280887473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280887611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894390 + ... + 894703.

It is an arithmetic number, because the mean of its divisors is an integer number (70669213).

Almost surely, 2^280887601 is an apocalyptic number.

It is an amenable number.

280887601 is a deficient number, since it is larger than the sum of its proper divisors (1789251).

280887601 is a wasteful number, since it uses less digits than its factorization.

280887601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789250.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 280887601 is about 16759.7016978227. The cubic root of 280887601 is about 654.9038189873.

It can be divided in two parts, 2808 and 87601, that added together give a palindrome (90409).

The spelling of 280887601 in words is "two hundred eighty million, eight hundred eighty-seven thousand, six hundred one".