2138628578 has 16 divisors (see below), whose sum is σ = 3263893920. Its totient is φ = 1050681600.

The previous prime is 2138628571. The next prime is 2138628617. The reversal of 2138628578 is 8758268312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2138628571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390338 + ... + 395778.

It is an arithmetic number, because the mean of its divisors is an integer number (203993370).

Almost surely, 2^2138628578 is an apocalyptic number.

2138628578 is a deficient number, since it is larger than the sum of its proper divisors (1125265342).

2138628578 is a wasteful number, since it uses less digits than its factorization.

2138628578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8833.

The product of its digits is 1290240, while the sum is 50.

The square root of 2138628578 is about 46245.3087134252. The cubic root of 2138628578 is about 1288.3834041295.

The spelling of 2138628578 in words is "two billion, one hundred thirty-eight million, six hundred twenty-eight thousand, five hundred seventy-eight".