161678140 has 48 divisors (see below), whose sum is σ = 368944128. Its totient is φ = 59157504.

The previous prime is 161678131. The next prime is 161678141. The reversal of 161678140 is 41876161.

It is a super-2 number, since 2×161678140² = 52279641907719200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161678096 and 161678105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161678141) 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, 26629 + ... + 32131.

It is an arithmetic number, because the mean of its divisors is an integer number (7686336).

Almost surely, 2^161678140 is an apocalyptic number.

161678140 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 161678140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184472064).

161678140 is an abundant number, since it is smaller than the sum of its proper divisors (207265988).

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

161678140 is a wasteful number, since it uses less digits than its factorization.

161678140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5638 (or 5636 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 161678140 is about 12715.2719200181. The cubic root of 161678140 is about 544.7749147679.

The spelling of 161678140 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, one hundred forty".