168907642 has 4 divisors (see below), whose sum is σ = 253361466. Its totient is φ = 84453820.

The previous prime is 168907639. The next prime is 168907643. The reversal of 168907642 is 246709861.

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., 119049921 + 49857721 = 10911^2 + 7061^2 .

It is not an unprimeable number, because it can be changed into a prime (168907643) 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, 42226909 + ... + 42226912.

Almost surely, 2^168907642 is an apocalyptic number.

168907642 is a deficient number, since it is larger than the sum of its proper divisors (84453824).

168907642 is an equidigital number, since it uses as much as digits as its factorization.

168907642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84453823.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 168907642 is about 12996.4472837772. The cubic root of 168907642 is about 552.7767477128.

The spelling of 168907642 in words is "one hundred sixty-eight million, nine hundred seven thousand, six hundred forty-two".