161216740 has 48 divisors (see below), whose sum is σ = 354783744. Its totient is φ = 61459200.

The previous prime is 161216707. The next prime is 161216743. The reversal of 161216740 is 47612161.

It is a junction number, because it is equal to n+sod(n) for n = 161216699 and 161216708.

It is not an unprimeable number, because it can be changed into a prime (161216743) 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, 39600 + ... + 43480.

It is an arithmetic number, because the mean of its divisors is an integer number (7391328).

Almost surely, 2^161216740 is an apocalyptic number.

161216740 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 161216740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177391872).

161216740 is an abundant number, since it is smaller than the sum of its proper divisors (193567004).

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

161216740 is a wasteful number, since it uses less digits than its factorization.

161216740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988 (or 3986 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 161216740 is about 12697.1154204410. The cubic root of 161216740 is about 544.2561915058.

The spelling of 161216740 in words is "one hundred sixty-one million, two hundred sixteen thousand, seven hundred forty".