161077740 has 96 divisors (see below), whose sum is σ = 474356736. Its totient is φ = 40761600.

The previous prime is 161077739. The next prime is 161077751. The reversal of 161077740 is 47770161.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207994 + ... + 208766.

It is an arithmetic number, because the mean of its divisors is an integer number (4941216).

Almost surely, 2^161077740 is an apocalyptic number.

161077740 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 161077740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237178368).

161077740 is an abundant number, since it is smaller than the sum of its proper divisors (313278996).

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

161077740 is a wasteful number, since it uses less digits than its factorization.

161077740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 33.

The square root of 161077740 is about 12691.6405558935. The cubic root of 161077740 is about 544.0997285083.

The spelling of 161077740 in words is "one hundred sixty-one million, seventy-seven thousand, seven hundred forty".