168428501 has 4 divisors (see below), whose sum is σ = 169501452. Its totient is φ = 167355552.

The previous prime is 168428479. The next prime is 168428531. The reversal of 168428501 is 105824861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25745476 + 142683025 = 5074^2 + 11945^2 .

It is a cyclic number.

It is not a de Polignac number, because 168428501 - 2⁶ = 168428437 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168428531) 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 3 ways as a sum of consecutive naturals, for example, 536240 + ... + 536553.

It is an arithmetic number, because the mean of its divisors is an integer number (42375363).

Almost surely, 2^168428501 is an apocalyptic number.

It is an amenable number.

168428501 is a deficient number, since it is larger than the sum of its proper divisors (1072951).

168428501 is a wasteful number, since it uses less digits than its factorization.

168428501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072950.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 168428501 is about 12978.0006549545. Note that the first 3 decimals coincide. The cubic root of 168428501 is about 552.2535646738.

The spelling of 168428501 in words is "one hundred sixty-eight million, four hundred twenty-eight thousand, five hundred one".