2158673728 has 14 divisors (see below), whose sum is σ = 4283618306. Its totient is φ = 1079336832.

The previous prime is 2158673723. The next prime is 2158673731. The reversal of 2158673728 is 8273768512.

It can be written as a sum of positive squares in only one way, i.e., 1334294784 + 824378944 = 36528^2 + 28712^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158673723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16864575 + ... + 16864702.

Almost surely, 2^2158673728 is an apocalyptic number.

It is an amenable number.

2158673728 is a deficient number, since it is larger than the sum of its proper divisors (2124944578).

2158673728 is an equidigital number, since it uses as much as digits as its factorization.

2158673728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33729289 (or 33729279 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

The square root of 2158673728 is about 46461.5295486492. The cubic root of 2158673728 is about 1292.3961888870.

The spelling of 2158673728 in words is "two billion, one hundred fifty-eight million, six hundred seventy-three thousand, seven hundred twenty-eight".