161490720 has 96 divisors (see below), whose sum is σ = 510572160. Its totient is φ = 42905600.

The previous prime is 161490649. The next prime is 161490727. The reversal of 161490720 is 27094161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×161490720² = 52158505292236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161490727) 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, 192061 + ... + 192899.

It is an arithmetic number, because the mean of its divisors is an integer number (5318460).

Almost surely, 2^161490720 is an apocalyptic number.

161490720 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 161490720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255286080).

161490720 is an abundant number, since it is smaller than the sum of its proper divisors (349081440).

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

161490720 is a wasteful number, since it uses less digits than its factorization.

161490720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 161490720 is about 12707.8999051771. The cubic root of 161490720 is about 544.5643293158.

The spelling of 161490720 in words is "one hundred sixty-one million, four hundred ninety thousand, seven hundred twenty".