2170638706 has 4 divisors (see below), whose sum is σ = 3255958062. Its totient is φ = 1085319352.

The previous prime is 2170638703. The next prime is 2170638737. The reversal of 2170638706 is 6078360712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2121063025 + 49575681 = 46055^2 + 7041^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2170638703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542659675 + ... + 542659678.

Almost surely, 2^2170638706 is an apocalyptic number.

2170638706 is a deficient number, since it is larger than the sum of its proper divisors (1085319356).

2170638706 is a wasteful number, since it uses less digits than its factorization.

2170638706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085319355.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 2170638706 is about 46590.1138225697. The cubic root of 2170638706 is about 1294.7795982547.

The spelling of 2170638706 in words is "two billion, one hundred seventy million, six hundred thirty-eight thousand, seven hundred six".