2128357815 has 16 divisors (see below), whose sum is σ = 3411072000. Its totient is φ = 1133224352.

The previous prime is 2128357813. The next prime is 2128357843. The reversal of 2128357815 is 5187538212.

It is a cyclic number.

It is not a de Polignac number, because 2128357815 - 2¹ = 2128357813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128357813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109455 + ... + 127424.

It is an arithmetic number, because the mean of its divisors is an integer number (213192000).

Almost surely, 2^2128357815 is an apocalyptic number.

2128357815 is a deficient number, since it is larger than the sum of its proper divisors (1282714185).

2128357815 is a wasteful number, since it uses less digits than its factorization.

2128357815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237486.

The product of its digits is 134400, while the sum is 42.

The square root of 2128357815 is about 46134.1285275879. The cubic root of 2128357815 is about 1286.3176066448.

The spelling of 2128357815 in words is "two billion, one hundred twenty-eight million, three hundred fifty-seven thousand, eight hundred fifteen".