161587536 has 160 divisors (see below), whose sum is σ = 481576320. Its totient is φ = 46233600.

The previous prime is 161587511. The next prime is 161587537. The reversal of 161587536 is 635785161.

It is a super-2 number, since 2×161587536² = 52221063581102592, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161587537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 933946 + ... + 934118.

It is an arithmetic number, because the mean of its divisors is an integer number (3009852).

Almost surely, 2^161587536 is an apocalyptic number.

161587536 is a gapful number since it is divisible by the number (16) 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 161587536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240788160).

161587536 is an abundant number, since it is smaller than the sum of its proper divisors (319988784).

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

161587536 is a wasteful number, since it uses less digits than its factorization.

161587536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 279 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The square root of 161587536 is about 12711.7086184352. The cubic root of 161587536 is about 544.6731322812.

The spelling of 161587536 in words is "one hundred sixty-one million, five hundred eighty-seven thousand, five hundred thirty-six".