163709028 has 36 divisors (see below), whose sum is σ = 472937920. Its totient is φ = 46773936.

The previous prime is 163709027. The next prime is 163709033. The reversal of 163709028 is 820907361.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 163708983 and 163709001.

It is not an unprimeable number, because it can be changed into a prime (163709027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 324568 + ... + 325071.

Almost surely, 2^163709028 is an apocalyptic number.

163709028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

163709028 is an abundant number, since it is smaller than the sum of its proper divisors (309228892).

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

163709028 is a wasteful number, since it uses less digits than its factorization.

163709028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649656 (or 649651 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 163709028 is about 12794.8828834030. The cubic root of 163709028 is about 547.0464574463.

The spelling of 163709028 in words is "one hundred sixty-three million, seven hundred nine thousand, twenty-eight".