163870640 has 40 divisors (see below), whose sum is σ = 384023040. Its totient is φ = 65032128.

The previous prime is 163870613. The next prime is 163870657. The reversal of 163870640 is 46078361.

163870640 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 tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 163870640.

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, 1290257 + ... + 1290383.

It is an arithmetic number, because the mean of its divisors is an integer number (9600576).

Almost surely, 2^163870640 is an apocalyptic number.

163870640 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 163870640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192011520).

163870640 is an abundant number, since it is smaller than the sum of its proper divisors (220152400).

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

163870640 is an frugal number, since it uses more digits than its factorization.

163870640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 163870640 is about 12801.1968190478. The cubic root of 163870640 is about 547.2264112681.

The spelling of 163870640 in words is "one hundred sixty-three million, eight hundred seventy thousand, six hundred forty".