161958720 has 336 divisors, whose sum is σ = 654637248. Its totient is φ = 33546240.

The previous prime is 161958703. The next prime is 161958743. The reversal of 161958720 is 27859161.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 517284 + ... + 517596.

Almost surely, 2^161958720 is an apocalyptic number.

161958720 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 161958720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327318624).

161958720 is an abundant number, since it is smaller than the sum of its proper divisors (492678528).

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

161958720 is a wasteful number, since it uses less digits than its factorization.

161958720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 161958720 is about 12726.3003264892. The cubic root of 161958720 is about 545.0898709915.

The spelling of 161958720 in words is "one hundred sixty-one million, nine hundred fifty-eight thousand, seven hundred twenty".