280987679 has 8 divisors (see below), whose sum is σ = 340018848. Its totient is φ = 226679040.

The previous prime is 280987669. The next prime is 280987691. The reversal of 280987679 is 976789082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280987679 - 2²⁸ = 12552223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280987639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180502 + ... + 1180739.

It is an arithmetic number, because the mean of its divisors is an integer number (42502356).

Almost surely, 2^280987679 is an apocalyptic number.

280987679 is a deficient number, since it is larger than the sum of its proper divisors (59031169).

280987679 is a wasteful number, since it uses less digits than its factorization.

280987679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361265.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 280987679 is about 16762.6871055926. The cubic root of 280987679 is about 654.9815887450.

The spelling of 280987679 in words is "two hundred eighty million, nine hundred eighty-seven thousand, six hundred seventy-nine".