168438428 has 12 divisors (see below), whose sum is σ = 298499040. Its totient is φ = 83152992.

The previous prime is 168438379. The next prime is 168438433. The reversal of 168438428 is 824834861.

It is a super-2 number, since 2×168438428² = 56743008054222368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 266201 + ... + 266832.

It is an arithmetic number, because the mean of its divisors is an integer number (24874920).

Almost surely, 2^168438428 is an apocalyptic number.

It is an amenable number.

168438428 is a deficient number, since it is larger than the sum of its proper divisors (130060612).

168438428 is a wasteful number, since it uses less digits than its factorization.

168438428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533116 (or 533114 counting only the distinct ones).

The product of its digits is 294912, while the sum is 44.

The square root of 168438428 is about 12978.3831042237. The cubic root of 168438428 is about 552.2644142102.

It can be divided in two parts, 16843842 and 8, that multiplied together give a triangular number (134750736 = T₁₆₄₁₆).

The spelling of 168438428 in words is "one hundred sixty-eight million, four hundred thirty-eight thousand, four hundred twenty-eight".