161867520 has 108 divisors (see below), whose sum is σ = 560084616. Its totient is φ = 43161600.

The previous prime is 161867501. The next prime is 161867527. The reversal of 161867520 is 25768161.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161867527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4495 + ... + 18545.

Almost surely, 2^161867520 is an apocalyptic number.

161867520 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 161867520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280042308).

161867520 is an abundant number, since it is smaller than the sum of its proper divisors (398217096).

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

161867520 is a wasteful number, since it uses less digits than its factorization.

161867520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14078 (or 14061 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 161867520 is about 12722.7166910216. The cubic root of 161867520 is about 544.9875372399.

The spelling of 161867520 in words is "one hundred sixty-one million, eight hundred sixty-seven thousand, five hundred twenty".