2129648178 has 32 divisors (see below), whose sum is σ = 4913270784. Its totient is φ = 602782992.

The previous prime is 2129648153. The next prime is 2129648189. The reversal of 2129648178 is 8718469212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232450 + ... + 241437.

It is an arithmetic number, because the mean of its divisors is an integer number (153539712).

Almost surely, 2^2129648178 is an apocalyptic number.

2129648178 is an abundant number, since it is smaller than the sum of its proper divisors (2783622606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2129648178 is a wasteful number, since it uses less digits than its factorization.

2129648178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474006.

The product of its digits is 387072, while the sum is 48.

The square root of 2129648178 is about 46148.1113156324. Note that the first 3 decimals coincide. The cubic root of 2129648178 is about 1286.5775067602.

The spelling of 2129648178 in words is "two billion, one hundred twenty-nine million, six hundred forty-eight thousand, one hundred seventy-eight".