161640768 has 28 divisors (see below), whose sum is σ = 427675040. Its totient is φ = 53880192.

The previous prime is 161640701. The next prime is 161640779. The reversal of 161640768 is 867046161.

It is a happy number.

It is a super-2 number, since 2×161640768² = 52255475759259648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420748 + ... + 421131.

Almost surely, 2^161640768 is an apocalyptic number.

It is an amenable number.

161640768 is an abundant number, since it is smaller than the sum of its proper divisors (266034272).

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

161640768 is an equidigital number, since it uses as much as digits as its factorization.

161640768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841894 (or 841884 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 161640768 is about 12713.8022636818. The cubic root of 161640768 is about 544.7329365161.

The spelling of 161640768 in words is "one hundred sixty-one million, six hundred forty thousand, seven hundred sixty-eight".