280987449205 has 8 divisors (see below), whose sum is σ = 343546919352. Its totient is φ = 220548639168.

The previous prime is 280987449203. The next prime is 280987449221. The reversal of 280987449205 is 502944789082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41974994884 + 239012454321 = 204878^2 + 488889^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 280987449205 - 2¹ = 280987449203 is a prime.

It is a super-2 number, since 2×280987449205² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280987449205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280987449203) 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, 530164734 + ... + 530165263.

It is an arithmetic number, because the mean of its divisors is an integer number (42943364919).

Almost surely, 2^280987449205 is an apocalyptic number.

It is an amenable number.

280987449205 is a deficient number, since it is larger than the sum of its proper divisors (62559470147).

280987449205 is a wasteful number, since it uses less digits than its factorization.

280987449205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060330055.

The product of its (nonzero) digits is 11612160, while the sum is 58.

The spelling of 280987449205 in words is "two hundred eighty billion, nine hundred eighty-seven million, four hundred forty-nine thousand, two hundred five".