163681408 has 64 divisors (see below), whose sum is σ = 359562240. Its totient is φ = 73600000.

The previous prime is 163681387. The next prime is 163681429. The reversal of 163681408 is 804186361.

It is an interprime number because it is at equal distance from previous prime (163681387) and next prime (163681429).

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141633 + ... + 142783.

It is an arithmetic number, because the mean of its divisors is an integer number (5618160).

Almost surely, 2^163681408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163681408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179781120).

163681408 is an abundant number, since it is smaller than the sum of its proper divisors (195880832).

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

163681408 is a wasteful number, since it uses less digits than its factorization.

163681408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 163681408 is about 12793.8035001324. The cubic root of 163681408 is about 547.0156909228.

The spelling of 163681408 in words is "one hundred sixty-three million, six hundred eighty-one thousand, four hundred eight".