163745640 has 48 divisors (see below), whose sum is σ = 532174500. Its totient is φ = 43665408.

The previous prime is 163745599. The next prime is 163745653. The reversal of 163745640 is 46547361.

It is a happy number.

163745640 is a `hidden beast` number, since 1 + 6 + 3 + 7 + 4 + 5 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 148206276 + 15539364 = 12174^2 + 3942^2 .

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 = 163745595 and 163745604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227065 + ... + 227784.

Almost surely, 2^163745640 is an apocalyptic number.

163745640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163745640 is an abundant number, since it is smaller than the sum of its proper divisors (368428860).

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

163745640 is a wasteful number, since it uses less digits than its factorization.

163745640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454866 (or 454859 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 163745640 is about 12796.3135316387. The cubic root of 163745640 is about 547.0872350224.

The spelling of 163745640 in words is "one hundred sixty-three million, seven hundred forty-five thousand, six hundred forty".