161587650 has 96 divisors (see below), whose sum is σ = 477969408. Its totient is φ = 35323200.

The previous prime is 161587633. The next prime is 161587687. The reversal of 161587650 is 56785161.

It is a super-2 number, since 2×161587650² = 52221137265045000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161587599 and 161587608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20805 + ... + 27495.

It is an arithmetic number, because the mean of its divisors is an integer number (4978848).

Almost surely, 2^161587650 is an apocalyptic number.

161587650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161587650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238984704).

161587650 is an abundant number, since it is smaller than the sum of its proper divisors (316381758).

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

161587650 is a wasteful number, since it uses less digits than its factorization.

161587650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6736 (or 6731 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 161587650 is about 12711.7131024894. The cubic root of 161587650 is about 544.6732603701.

The spelling of 161587650 in words is "one hundred sixty-one million, five hundred eighty-seven thousand, six hundred fifty".