2178028791 has 32 divisors (see below), whose sum is σ = 3340206080. Its totient is φ = 1401569568.

The previous prime is 2178028781. The next prime is 2178028841. The reversal of 2178028791 is 1978208712.

It is not a de Polignac number, because 2178028791 - 2⁵ = 2178028759 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178028771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118290 + ... + 135456.

It is an arithmetic number, because the mean of its divisors is an integer number (104381440).

Almost surely, 2^2178028791 is an apocalyptic number.

2178028791 is a deficient number, since it is larger than the sum of its proper divisors (1162177289).

2178028791 is a wasteful number, since it uses less digits than its factorization.

2178028791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17340 (or 17334 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 2178028791 is about 46669.3560165554. The cubic root of 2178028791 is about 1296.2473218409.

The spelling of 2178028791 in words is "two billion, one hundred seventy-eight million, twenty-eight thousand, seven hundred ninety-one".