2142156728 has 8 divisors (see below), whose sum is σ = 4016543880. Its totient is φ = 1071078360.

The previous prime is 2142156713. The next prime is 2142156733. The reversal of 2142156728 is 8276512412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2142156691 and 2142156700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133884788 + ... + 133884803.

It is an arithmetic number, because the mean of its divisors is an integer number (502067985).

Almost surely, 2^2142156728 is an apocalyptic number.

It is an amenable number.

2142156728 is a deficient number, since it is larger than the sum of its proper divisors (1874387152).

2142156728 is a wasteful number, since it uses less digits than its factorization.

2142156728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267769597 (or 267769593 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 2142156728 is about 46283.4390252064. The cubic root of 2142156728 is about 1289.0915078450.

The spelling of 2142156728 in words is "two billion, one hundred forty-two million, one hundred fifty-six thousand, seven hundred twenty-eight".