161936880 has 160 divisors (see below), whose sum is σ = 587962368. Its totient is φ = 36096000.

The previous prime is 161936869. The next prime is 161936891. The reversal of 161936880 is 88639161.

It is an interprime number because it is at equal distance from previous prime (161936869) and next prime (161936891).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67705 + ... + 70055.

Almost surely, 2^161936880 is an apocalyptic number.

161936880 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 161936880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293981184).

161936880 is an abundant number, since it is smaller than the sum of its proper divisors (426025488).

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

161936880 is a wasteful number, since it uses less digits than its factorization.

161936880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 161936880 is about 12725.4422320012. The cubic root of 161936880 is about 545.0653682500.

The spelling of 161936880 in words is "one hundred sixty-one million, nine hundred thirty-six thousand, eight hundred eighty".