2798878561 has 4 divisors (see below), whose sum is σ = 2800814272. Its totient is φ = 2796942852.

The previous prime is 2798878559. The next prime is 2798878583. The reversal of 2798878561 is 1658788972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2798878561 - 2¹ = 2798878559 is a prime.

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 2798878561.

It is not an unprimeable number, because it can be changed into a prime (2798870561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965685 + ... + 968578.

It is an arithmetic number, because the mean of its divisors is an integer number (700203568).

Almost surely, 2^2798878561 is an apocalyptic number.

It is an amenable number.

2798878561 is a deficient number, since it is larger than the sum of its proper divisors (1935711).

2798878561 is a wasteful number, since it uses less digits than its factorization.

2798878561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935710.

The product of its digits is 13547520, while the sum is 61.

The square root of 2798878561 is about 52904.4285575414. The cubic root of 2798878561 is about 1409.2715518658.

The spelling of 2798878561 in words is "two billion, seven hundred ninety-eight million, eight hundred seventy-eight thousand, five hundred sixty-one".