2128778278 has 16 divisors (see below), whose sum is σ = 3666795840. Its totient is φ = 916698600.

The previous prime is 2128778269. The next prime is 2128778279. The reversal of 2128778278 is 8728778212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128778279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2545968 + ... + 2546803.

It is an arithmetic number, because the mean of its divisors is an integer number (229174740).

Almost surely, 2^2128778278 is an apocalyptic number.

2128778278 is a deficient number, since it is larger than the sum of its proper divisors (1538017562).

2128778278 is a wasteful number, since it uses less digits than its factorization.

2128778278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092803.

The product of its digits is 1404928, while the sum is 52.

The square root of 2128778278 is about 46138.6852651872. The cubic root of 2128778278 is about 1286.4023062732.

The spelling of 2128778278 in words is "two billion, one hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred seventy-eight".