163878978 has 16 divisors (see below), whose sum is σ = 331138080. Its totient is φ = 54062976.

The previous prime is 163878973. The next prime is 163878983. The reversal of 163878978 is 879878361.

It is an interprime number because it is at equal distance from previous prime (163878973) and next prime (163878983).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163878973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140208 + ... + 141371.

It is an arithmetic number, because the mean of its divisors is an integer number (20696130).

Almost surely, 2^163878978 is an apocalyptic number.

163878978 is an abundant number, since it is smaller than the sum of its proper divisors (167259102).

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

163878978 is a wasteful number, since it uses less digits than its factorization.

163878978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281681.

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

The square root of 163878978 is about 12801.5224875794. The cubic root of 163878978 is about 547.2356923621.

The spelling of 163878978 in words is "one hundred sixty-three million, eight hundred seventy-eight thousand, nine hundred seventy-eight".