2164838978 has 8 divisors (see below), whose sum is σ = 3251631168. Its totient is φ = 1080961924.

The previous prime is 2164838933. The next prime is 2164838983. The reversal of 2164838978 is 8798384612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726926 + ... + 729897.

It is an arithmetic number, because the mean of its divisors is an integer number (406453896).

Almost surely, 2^2164838978 is an apocalyptic number.

2164838978 is a deficient number, since it is larger than the sum of its proper divisors (1086792190).

2164838978 is a wasteful number, since it uses less digits than its factorization.

2164838978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457568.

The product of its digits is 4644864, while the sum is 56.

The square root of 2164838978 is about 46527.8301449788. The cubic root of 2164838978 is about 1293.6253961133.

The spelling of 2164838978 in words is "two billion, one hundred sixty-four million, eight hundred thirty-eight thousand, nine hundred seventy-eight".