170678642 has 4 divisors (see below), whose sum is σ = 256017966. Its totient is φ = 85339320.

The previous prime is 170678639. The next prime is 170678647. The reversal of 170678642 is 246876071.

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., 138744841 + 31933801 = 11779^2 + 5651^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 170678642.

It is not an unprimeable number, because it can be changed into a prime (170678647) by changing a digit.

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 as a sum of consecutive naturals, namely, 42669659 + ... + 42669662.

Almost surely, 2^170678642 is an apocalyptic number.

170678642 is a deficient number, since it is larger than the sum of its proper divisors (85339324).

170678642 is an equidigital number, since it uses as much as digits as its factorization.

170678642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85339323.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 170678642 is about 13064.4036220564. The cubic root of 170678642 is about 554.7019929777.

The spelling of 170678642 in words is "one hundred seventy million, six hundred seventy-eight thousand, six hundred forty-two".