2178728151 has 8 divisors (see below), whose sum is σ = 2975823984. Its totient is φ = 1417058880.

The previous prime is 2178728141. The next prime is 2178728159. The reversal of 2178728151 is 1518278712.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2178728151 - 2¹⁷ = 2178597079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178728159) 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, 8856496 + ... + 8856741.

It is an arithmetic number, because the mean of its divisors is an integer number (371977998).

Almost surely, 2^2178728151 is an apocalyptic number.

2178728151 is a deficient number, since it is larger than the sum of its proper divisors (797095833).

2178728151 is a wasteful number, since it uses less digits than its factorization.

2178728151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17713281.

The product of its digits is 62720, while the sum is 42.

The square root of 2178728151 is about 46676.8481262392. The cubic root of 2178728151 is about 1296.3860476647.

The spelling of 2178728151 in words is "two billion, one hundred seventy-eight million, seven hundred twenty-eight thousand, one hundred fifty-one".