280991012 has 6 divisors (see below), whose sum is σ = 491734278. Its totient is φ = 140495504.

The previous prime is 280991003. The next prime is 280991017. The reversal of 280991012 is 210199082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 153165376 + 127825636 = 12376^2 + 11306^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 280991012.

It is not an unprimeable number, because it can be changed into a prime (280991017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35123873 + ... + 35123880.

It is an arithmetic number, because the mean of its divisors is an integer number (81955713).

Almost surely, 2^280991012 is an apocalyptic number.

It is an amenable number.

280991012 is a deficient number, since it is larger than the sum of its proper divisors (210743266).

280991012 is a wasteful number, since it uses less digits than its factorization.

280991012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70247757 (or 70247755 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 280991012 is about 16762.7865225326. The cubic root of 280991012 is about 654.9841784730.

The spelling of 280991012 in words is "two hundred eighty million, nine hundred ninety-one thousand, twelve".