2780749969 has 4 divisors (see below), whose sum is σ = 2801977200. Its totient is φ = 2759522740.

The previous prime is 2780749897. The next prime is 2780749973. The reversal of 2780749969 is 9699470872.

2780749969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2780749969 - 2⁹ = 2780749457 is a prime.

It is a super-2 number, since 2×2780749969² = 15465140780187001922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780749369) 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, 10613419 + ... + 10613680.

It is an arithmetic number, because the mean of its divisors is an integer number (700494300).

Almost surely, 2^2780749969 is an apocalyptic number.

It is an amenable number.

2780749969 is a deficient number, since it is larger than the sum of its proper divisors (21227231).

2780749969 is a wasteful number, since it uses less digits than its factorization.

2780749969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21227230.

The product of its (nonzero) digits is 13716864, while the sum is 61.

The square root of 2780749969 is about 52732.8168126832. The cubic root of 2780749969 is about 1406.2222987557. Note that the first 4 decimals are identical.

The spelling of 2780749969 in words is "two billion, seven hundred eighty million, seven hundred forty-nine thousand, nine hundred sixty-nine".