161378910 has 288 divisors, whose sum is σ = 552726720. Its totient is φ = 31933440.

The previous prime is 161378891. The next prime is 161378927. The reversal of 161378910 is 19873161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2210634 + ... + 2210706.

It is an arithmetic number, because the mean of its divisors is an integer number (1919190).

Almost surely, 2^161378910 is an apocalyptic number.

161378910 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 161378910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276363360).

161378910 is an abundant number, since it is smaller than the sum of its proper divisors (391347810).

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

161378910 is a wasteful number, since it uses less digits than its factorization.

161378910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 161378910 is about 12703.4999114417. The cubic root of 161378910 is about 544.4386217928.

The spelling of 161378910 in words is "one hundred sixty-one million, three hundred seventy-eight thousand, nine hundred ten".