161832640 has 28 divisors (see below), whose sum is σ = 385364736. Its totient is φ = 64732928.

The previous prime is 161832637. The next prime is 161832641. The reversal of 161832640 is 46238161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (161832641) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 252544 + ... + 253183.

Almost surely, 2^161832640 is an apocalyptic number.

161832640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161832640 is an abundant number, since it is smaller than the sum of its proper divisors (223532096).

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

161832640 is an equidigital number, since it uses as much as digits as its factorization.

161832640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505744 (or 505734 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 161832640 is about 12721.3458407513. The cubic root of 161832640 is about 544.9483889066.

The spelling of 161832640 in words is "one hundred sixty-one million, eight hundred thirty-two thousand, six hundred forty".