163639140 has 96 divisors (see below), whose sum is σ = 527600640. Its totient is φ = 37120896.

The previous prime is 163639117. The next prime is 163639163. The reversal of 163639140 is 41936361.

163639140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (163639117) and next prime (163639163).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56979 + ... + 59781.

It is an arithmetic number, because the mean of its divisors is an integer number (5495840).

Almost surely, 2^163639140 is an apocalyptic number.

163639140 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 163639140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263800320).

163639140 is an abundant number, since it is smaller than the sum of its proper divisors (363961500).

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

163639140 is a wasteful number, since it uses less digits than its factorization.

163639140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2961 (or 2959 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 163639140 is about 12792.1515000410. The cubic root of 163639140 is about 546.9686009692.

The spelling of 163639140 in words is "one hundred sixty-three million, six hundred thirty-nine thousand, one hundred forty".