161700428 has 6 divisors (see below), whose sum is σ = 282975756. Its totient is φ = 80850212.

The previous prime is 161700389. The next prime is 161700437. The reversal of 161700428 is 824007161.

It is a super-2 number, since 2×161700428² = 52294056830766368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161700428.

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 as a sum of consecutive naturals, namely, 20212550 + ... + 20212557.

It is an arithmetic number, because the mean of its divisors is an integer number (47162626).

Almost surely, 2^161700428 is an apocalyptic number.

It is an amenable number.

161700428 is a deficient number, since it is larger than the sum of its proper divisors (121275328).

161700428 is a wasteful number, since it uses less digits than its factorization.

161700428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40425111 (or 40425109 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 161700428 is about 12716.1483162159. The cubic root of 161700428 is about 544.7999467757.

Adding to 161700428 its reverse (824007161), we get a palindrome (985707589).

The spelling of 161700428 in words is "one hundred sixty-one million, seven hundred thousand, four hundred twenty-eight".