163128780 has 72 divisors (see below), whose sum is σ = 499978752. Its totient is φ = 43047936.

The previous prime is 163128769. The next prime is 163128827. The reversal of 163128780 is 87821361.

163128780 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×163128780² = 53221997728576800, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12789 + ... + 22131.

Almost surely, 2^163128780 is an apocalyptic number.

163128780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163128780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249989376).

163128780 is an abundant number, since it is smaller than the sum of its proper divisors (336849972).

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

163128780 is a wasteful number, since it uses less digits than its factorization.

163128780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455 (or 9450 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 163128780 is about 12772.1877530829. The cubic root of 163128780 is about 546.3993777267.

The spelling of 163128780 in words is "one hundred sixty-three million, one hundred twenty-eight thousand, seven hundred eighty".