161740780 has 24 divisors (see below), whose sum is σ = 340402608. Its totient is φ = 64554048.

The previous prime is 161740757. The next prime is 161740783. The reversal of 161740780 is 87047161.

161740780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161740783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682 + ... + 17998.

It is an arithmetic number, because the mean of its divisors is an integer number (14183442).

Almost surely, 2^161740780 is an apocalyptic number.

161740780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161740780 is an abundant number, since it is smaller than the sum of its proper divisors (178661828).

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

161740780 is a wasteful number, since it uses less digits than its factorization.

161740780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17793 (or 17791 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 161740780 is about 12717.7348612086. The cubic root of 161740780 is about 544.8452608983.

The spelling of 161740780 in words is "one hundred sixty-one million, seven hundred forty thousand, seven hundred eighty".