168257640 has 32 divisors (see below), whose sum is σ = 504773280. Its totient is φ = 44868672.

The previous prime is 168257591. The next prime is 168257641. The reversal of 168257640 is 46752861.

It is not an unprimeable number, because it can be changed into a prime (168257641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 700954 + ... + 701193.

It is an arithmetic number, because the mean of its divisors is an integer number (15774165).

Almost surely, 2^168257640 is an apocalyptic number.

168257640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168257640 is an abundant number, since it is smaller than the sum of its proper divisors (336515640).

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

168257640 is a wasteful number, since it uses less digits than its factorization.

168257640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402161 (or 1402157 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 168257640 is about 12971.4162680873. The cubic root of 168257640 is about 552.0667583616.

The spelling of 168257640 in words is "one hundred sixty-eight million, two hundred fifty-seven thousand, six hundred forty".