161278680 has 64 divisors (see below), whose sum is σ = 489304800. Its totient is φ = 42521600.

The previous prime is 161278679. The next prime is 161278703. The reversal of 161278680 is 86872161.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3130 + ... + 18230.

Almost surely, 2^161278680 is an apocalyptic number.

161278680 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 161278680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244652400).

161278680 is an abundant number, since it is smaller than the sum of its proper divisors (328026120).

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

161278680 is a wasteful number, since it uses less digits than its factorization.

161278680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15204 (or 15200 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 161278680 is about 12699.5543228887. The cubic root of 161278680 is about 544.3258842521.

The spelling of 161278680 in words is "one hundred sixty-one million, two hundred seventy-eight thousand, six hundred eighty".