2178128 has 10 divisors (see below), whose sum is σ = 4220154. Its totient is φ = 1089056.

The previous prime is 2178083. The next prime is 2178131. The reversal of 2178128 is 8218712.

It can be written as a sum of positive squares in only one way, i.e., 2155024 + 23104 = 1468^2 + 152^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2178128.

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, 68051 + ... + 68082.

2^2178128 is an apocalyptic number.

It is an amenable number.

2178128 is a deficient number, since it is larger than the sum of its proper divisors (2042026).

2178128 is a wasteful number, since it uses less digits than its factorization.

2178128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136141 (or 136135 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 2178128 is about 1475.8482306796. The cubic root of 2178128 is about 129.6267002855.

It can be divided in two parts, 2178 and 128, that multiplied together give a square (278784 = 528²).

The spelling of 2178128 in words is "two million, one hundred seventy-eight thousand, one hundred twenty-eight".