169785428 has 12 divisors (see below), whose sum is σ = 304371732. Its totient is φ = 82822080.

The previous prime is 169785403. The next prime is 169785431. The reversal of 169785428 is 824587961.

It can be written as a sum of positive squares in 2 ways, for example, as 9560464 + 160224964 = 3092^2 + 12658^2 .

It is a super-2 number, since 2×169785428² = 57654183122286368, 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 517475 + ... + 517802.

It is an arithmetic number, because the mean of its divisors is an integer number (25364311).

Almost surely, 2^169785428 is an apocalyptic number.

It is an amenable number.

169785428 is a deficient number, since it is larger than the sum of its proper divisors (134586304).

169785428 is a wasteful number, since it uses less digits than its factorization.

169785428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035322 (or 1035320 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 169785428 is about 13030.1737517195. The cubic root of 169785428 is about 553.7326578314.

The spelling of 169785428 in words is "one hundred sixty-nine million, seven hundred eighty-five thousand, four hundred twenty-eight".