2780426009 has 4 divisors (see below), whose sum is σ = 2926764240. Its totient is φ = 2634087780.

The previous prime is 2780425997. The next prime is 2780426017. The reversal of 2780426009 is 9006240872.

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 a de Polignac number, because none of the positive numbers 2^k-2780426009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780426809) 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, 73169087 + ... + 73169124.

It is an arithmetic number, because the mean of its divisors is an integer number (731691060).

Almost surely, 2^2780426009 is an apocalyptic number.

It is an amenable number.

2780426009 is a deficient number, since it is larger than the sum of its proper divisors (146338231).

2780426009 is a wasteful number, since it uses less digits than its factorization.

2780426009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146338230.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 2780426009 is about 52729.7450117104. The cubic root of 2780426009 is about 1406.1676878926.

The spelling of 2780426009 in words is "two billion, seven hundred eighty million, four hundred twenty-six thousand, nine".