161786428 has 12 divisors (see below), whose sum is σ = 283508512. Its totient is φ = 80784000.

The previous prime is 161786423. The next prime is 161786431. The reversal of 161786428 is 824687161.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161786423) 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 in 3 ways as a sum of consecutive naturals, for example, 23925 + ... + 29932.

Almost surely, 2^161786428 is an apocalyptic number.

It is an amenable number.

161786428 is a deficient number, since it is larger than the sum of its proper divisors (121722084).

161786428 is a wasteful number, since it uses less digits than its factorization.

161786428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54612 (or 54610 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 161786428 is about 12719.5293938101. The cubic root of 161786428 is about 544.8965131903.

The spelling of 161786428 in words is "one hundred sixty-one million, seven hundred eighty-six thousand, four hundred twenty-eight".