163978878 has 64 divisors (see below), whose sum is σ = 385320960. Its totient is φ = 45556992.

The previous prime is 163978849. The next prime is 163978879. The reversal of 163978878 is 878879361.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163978879) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241876 + ... + 242552.

It is an arithmetic number, because the mean of its divisors is an integer number (6020640).

Almost surely, 2^163978878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163978878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192660480).

163978878 is an abundant number, since it is smaller than the sum of its proper divisors (221342082).

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

163978878 is a wasteful number, since it uses less digits than its factorization.

163978878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841.

The product of its digits is 4064256, while the sum is 57.

The square root of 163978878 is about 12805.4237727613. The cubic root of 163978878 is about 547.3468673715.

The spelling of 163978878 in words is "one hundred sixty-three million, nine hundred seventy-eight thousand, eight hundred seventy-eight".