163816740 has 36 divisors (see below), whose sum is σ = 496911324. Its totient is φ = 43684416.

The previous prime is 163816739. The next prime is 163816747. The reversal of 163816740 is 47618361.

163816740 is a `hidden beast` number, since 1 + 638 + 16 + 7 + 4 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 64256256 + 99560484 = 8016^2 + 9978^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 163816695 and 163816704.

It is not an unprimeable number, because it can be changed into a prime (163816747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454867 + ... + 455226.

Almost surely, 2^163816740 is an apocalyptic number.

163816740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163816740 is an abundant number, since it is smaller than the sum of its proper divisors (333094584).

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

163816740 is a wasteful number, since it uses less digits than its factorization.

163816740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910108 (or 910103 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 163816740 is about 12799.0913740000. The cubic root of 163816740 is about 547.1664071534.

The spelling of 163816740 in words is "one hundred sixty-three million, eight hundred sixteen thousand, seven hundred forty".