1978736706 has 12 divisors (see below), whose sum is σ = 4287262902. Its totient is φ = 659578896.

The previous prime is 1978736699. The next prime is 1978736717. The reversal of 1978736706 is 6076378791.

It can be written as a sum of positive squares in only one way, i.e., 1380494025 + 598242681 = 37155^2 + 24459^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54964891 + ... + 54964926.

Almost surely, 2^1978736706 is an apocalyptic number.

1978736706 is an abundant number, since it is smaller than the sum of its proper divisors (2308526196).

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

1978736706 is a wasteful number, since it uses less digits than its factorization.

1978736706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109929825 (or 109929822 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The square root of 1978736706 is about 44482.9934469343. The cubic root of 1978736706 is about 1255.4401203393.

The spelling of 1978736706 in words is "one billion, nine hundred seventy-eight million, seven hundred thirty-six thousand, seven hundred six".