1791289878 has 16 divisors (see below), whose sum is σ = 4094376960. Its totient is φ = 511797096.

The previous prime is 1791289867. The next prime is 1791289879. The reversal of 1791289878 is 8789821971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1791289879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21324838 + ... + 21324921.

It is an arithmetic number, because the mean of its divisors is an integer number (255898560).

Almost surely, 2^1791289878 is an apocalyptic number.

1791289878 is an abundant number, since it is smaller than the sum of its proper divisors (2303087082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1791289878 is a wasteful number, since it uses less digits than its factorization.

1791289878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42649771.

The product of its digits is 4064256, while the sum is 60.

The square root of 1791289878 is about 42323.6326181957. The cubic root of 1791289878 is about 1214.4751249459.

The spelling of 1791289878 in words is "one billion, seven hundred ninety-one million, two hundred eighty-nine thousand, eight hundred seventy-eight".