2157871678 has 8 divisors (see below), whose sum is σ = 3281147568. Its totient is φ = 1064155824.

The previous prime is 2157871673. The next prime is 2157871687. The reversal of 2157871678 is 8761787512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157871673) 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 in 3 ways as a sum of consecutive naturals, for example, 7389826 + ... + 7390117.

It is an arithmetic number, because the mean of its divisors is an integer number (410143446).

Almost surely, 2^2157871678 is an apocalyptic number.

2157871678 is a deficient number, since it is larger than the sum of its proper divisors (1123275890).

2157871678 is a wasteful number, since it uses less digits than its factorization.

2157871678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14780018.

The product of its digits is 1317120, while the sum is 52.

The square root of 2157871678 is about 46452.8974123251. The cubic root of 2157871678 is about 1292.2361068338.

The spelling of 2157871678 in words is "two billion, one hundred fifty-seven million, eight hundred seventy-one thousand, six hundred seventy-eight".