2144791978 has 32 divisors (see below), whose sum is σ = 4018664448. Its totient is φ = 837216000.

The previous prime is 2144791967. The next prime is 2144791997. The reversal of 2144791978 is 8791974412.

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, 137973 + ... + 152728.

It is an arithmetic number, because the mean of its divisors is an integer number (125583264).

Almost surely, 2^2144791978 is an apocalyptic number.

2144791978 is a deficient number, since it is larger than the sum of its proper divisors (1873872470).

2144791978 is a wasteful number, since it uses less digits than its factorization.

2144791978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290758.

The product of its digits is 1016064, while the sum is 52.

The square root of 2144791978 is about 46311.8988813890. The cubic root of 2144791978 is about 1289.6198984292.

The spelling of 2144791978 in words is "two billion, one hundred forty-four million, seven hundred ninety-one thousand, nine hundred seventy-eight".