280945949779 has 4 divisors (see below), whose sum is σ = 306486490680. Its totient is φ = 255405408880.

The previous prime is 280945949723. The next prime is 280945949783. The reversal of 280945949779 is 977949549082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280945949779 - 2¹³ = 280945941587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280945949719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12770270434 + ... + 12770270455.

It is an arithmetic number, because the mean of its divisors is an integer number (76621622670).

Almost surely, 2^280945949779 is an apocalyptic number.

280945949779 is a deficient number, since it is larger than the sum of its proper divisors (25540540901).

280945949779 is a wasteful number, since it uses less digits than its factorization.

280945949779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25540540900.

The product of its (nonzero) digits is 411505920, while the sum is 73.

The spelling of 280945949779 in words is "two hundred eighty billion, nine hundred forty-five million, nine hundred forty-nine thousand, seven hundred seventy-nine".