161861760 has 512 divisors, whose sum is σ = 660960000. Its totient is φ = 37158912.

The previous prime is 161861737. The next prime is 161861767. The reversal of 161861760 is 67168161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161861767) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5581426 + ... + 5581454.

Almost surely, 2^161861760 is an apocalyptic number.

161861760 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 161861760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330480000).

161861760 is an abundant number, since it is smaller than the sum of its proper divisors (499098240).

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

161861760 is a wasteful number, since it uses less digits than its factorization.

161861760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 161861760 is about 12722.4903222600. The cubic root of 161861760 is about 544.9810727652.

The spelling of 161861760 in words is "one hundred sixty-one million, eight hundred sixty-one thousand, seven hundred sixty".