161790450 has 96 divisors (see below), whose sum is σ = 418473216. Its totient is φ = 41333760.

The previous prime is 161790439. The next prime is 161790451. The reversal of 161790450 is 54097161.

It is a super-2 number, since 2×161790450² = 52352299422405000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161790451) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373434 + ... + 373866.

It is an arithmetic number, because the mean of its divisors is an integer number (4359096).

Almost surely, 2^161790450 is an apocalyptic number.

161790450 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 161790450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209236608).

161790450 is an abundant number, since it is smaller than the sum of its proper divisors (256682766).

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

161790450 is a wasteful number, since it uses less digits than its factorization.

161790450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 161790450 is about 12719.6874961612. The cubic root of 161790450 is about 544.9010285168.

The spelling of 161790450 in words is "one hundred sixty-one million, seven hundred ninety thousand, four hundred fifty".