161622736 has 40 divisors (see below), whose sum is σ = 344156544. Its totient is φ = 72917760.

The previous prime is 161622731. The next prime is 161622737. The reversal of 161622736 is 637226161.

It is a happy number.

It is a super-2 number, since 2×161622736² = 52243817584251392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161622731) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20761 + ... + 27463.

Almost surely, 2^161622736 is an apocalyptic number.

161622736 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 161622736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172078272).

161622736 is an abundant number, since it is smaller than the sum of its proper divisors (182533808).

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

161622736 is a wasteful number, since it uses less digits than its factorization.

161622736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6859 (or 6853 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 161622736 is about 12713.0930933428. The cubic root of 161622736 is about 544.7126796842.

Adding to 161622736 its reverse (637226161), we get a palindrome (798848897).

The spelling of 161622736 in words is "one hundred sixty-one million, six hundred twenty-two thousand, seven hundred thirty-six".