161868784 has 160 divisors (see below), whose sum is σ = 415259136. Its totient is φ = 59304960.

The previous prime is 161868769. The next prime is 161868797. The reversal of 161868784 is 487868161.

It is a happy number.

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, 2415919 + ... + 2415985.

Almost surely, 2^161868784 is an apocalyptic number.

161868784 is a gapful number since it is divisible by the number (14) 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 161868784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207629568).

161868784 is an abundant number, since it is smaller than the sum of its proper divisors (253390352).

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

161868784 is a wasteful number, since it uses less digits than its factorization.

161868784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 177 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 161868784 is about 12722.7663658498. The cubic root of 161868784 is about 544.9889558124.

The spelling of 161868784 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, seven hundred eighty-four".