161502720 has 160 divisors (see below), whose sum is σ = 547116768. Its totient is φ = 40501248.

The previous prime is 161502709. The next prime is 161502727. The reversal of 161502720 is 27205161.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161502727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129942 + ... + 131178.

Almost surely, 2^161502720 is an apocalyptic number.

161502720 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 161502720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273558384).

161502720 is an abundant number, since it is smaller than the sum of its proper divisors (385614048).

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

161502720 is a wasteful number, since it uses less digits than its factorization.

161502720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280 (or 1264 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 161502720 is about 12708.3720436569. The cubic root of 161502720 is about 544.5778174182.

Adding to 161502720 its reverse (27205161), we get a palindrome (188707881).

The spelling of 161502720 in words is "one hundred sixty-one million, five hundred two thousand, seven hundred twenty".