2785278989 has 4 divisors (see below), whose sum is σ = 2931872640. Its totient is φ = 2638685340.

The previous prime is 2785278967. The next prime is 2785279009. The reversal of 2785278989 is 9898725872.

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 2785278989 - 2¹² = 2785274893 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2785278289) 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, 73296797 + ... + 73296834.

It is an arithmetic number, because the mean of its divisors is an integer number (732968160).

Almost surely, 2^2785278989 is an apocalyptic number.

It is an amenable number.

2785278989 is a deficient number, since it is larger than the sum of its proper divisors (146593651).

2785278989 is a wasteful number, since it uses less digits than its factorization.

2785278989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146593650.

The product of its digits is 40642560, while the sum is 65.

The square root of 2785278989 is about 52775.7424296428. The cubic root of 2785278989 is about 1406.9853248549.

The spelling of 2785278989 in words is "two billion, seven hundred eighty-five million, two hundred seventy-eight thousand, nine hundred eighty-nine".