2780598891 has 16 divisors (see below), whose sum is σ = 4237841664. Its totient is φ = 1588636704.

The previous prime is 2780598883. The next prime is 2780598893. The reversal of 2780598891 is 1988950872.

It is not a de Polignac number, because 2780598891 - 2³ = 2780598883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780598893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217801 + ... + 230213.

It is an arithmetic number, because the mean of its divisors is an integer number (264865104).

Almost surely, 2^2780598891 is an apocalyptic number.

2780598891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2780598891 is a deficient number, since it is larger than the sum of its proper divisors (1457242773).

2780598891 is a wasteful number, since it uses less digits than its factorization.

2780598891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23090.

The product of its (nonzero) digits is 2903040, while the sum is 57.

The square root of 2780598891 is about 52731.3843076398. The cubic root of 2780598891 is about 1406.1968316333.

The spelling of 2780598891 in words is "two billion, seven hundred eighty million, five hundred ninety-eight thousand, eight hundred ninety-one".