161002728 has 40 divisors (see below), whose sum is σ = 450958530. Its totient is φ = 53667360.

The previous prime is 161002697. The next prime is 161002753. The reversal of 161002728 is 827200161.

161002728 is a `hidden beast` number, since 1 + 610 + 0 + 27 + 28 = 666.

It can be written as a sum of positive squares in only one way, i.e., 153809604 + 7193124 = 12402^2 + 2682^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

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 9 ways as a sum of consecutive naturals, for example, 123583 + ... + 124878.

Almost surely, 2^161002728 is an apocalyptic number.

161002728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161002728 is an abundant number, since it is smaller than the sum of its proper divisors (289955802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161002728 is a wasteful number, since it uses less digits than its factorization.

161002728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248479 (or 248466 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 161002728 is about 12688.6850382536. The cubic root of 161002728 is about 544.0152551230.

Adding to 161002728 its reverse (827200161), we get a palindrome (988202889).

The spelling of 161002728 in words is "one hundred sixty-one million, two thousand, seven hundred twenty-eight".