163187640 has 432 divisors, whose sum is σ = 697043880. Its totient is φ = 32739840.

The previous prime is 163187639. The next prime is 163187653. The reversal of 163187640 is 46781361.

163187640 is a `hidden beast` number, since 1 + 6 + 3 + 1 + 8 + 7 + 640 = 666.

163187640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 163187595 and 163187604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 5627146 + ... + 5627174.

Almost surely, 2^163187640 is an apocalyptic number.

163187640 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 163187640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348521940).

163187640 is an abundant number, since it is smaller than the sum of its proper divisors (533856240).

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

163187640 is a wasteful number, since it uses less digits than its factorization.

163187640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 57 counting only the distinct ones).

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

The square root of 163187640 is about 12774.4917707124. The cubic root of 163187640 is about 546.4650869576.

The spelling of 163187640 in words is "one hundred sixty-three million, one hundred eighty-seven thousand, six hundred forty".