161889750 has 192 divisors, whose sum is σ = 495286272. Its totient is φ = 37800000.

The previous prime is 161889737. The next prime is 161889773. The reversal of 161889750 is 57988161.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 161889696 and 161889705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 767145 + ... + 767355.

It is an arithmetic number, because the mean of its divisors is an integer number (2579616).

Almost surely, 2^161889750 is an apocalyptic number.

161889750 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 161889750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247643136).

161889750 is an abundant number, since it is smaller than the sum of its proper divisors (333396522).

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

161889750 is a wasteful number, since it uses less digits than its factorization.

161889750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 161889750 is about 12723.5902951958. The cubic root of 161889750 is about 545.0124846339.

The spelling of 161889750 in words is "one hundred sixty-one million, eight hundred eighty-nine thousand, seven hundred fifty".