161463440 has 80 divisors (see below), whose sum is σ = 387015408. Its totient is φ = 62619648.

The previous prime is 161463391. The next prime is 161463451. The reversal of 161463440 is 44364161.

161463440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 24760576 + 136702864 = 4976^2 + 11692^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478952 + ... + 479288.

Almost surely, 2^161463440 is an apocalyptic number.

161463440 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 161463440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193507704).

161463440 is an abundant number, since it is smaller than the sum of its proper divisors (225551968).

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

161463440 is a wasteful number, since it uses less digits than its factorization.

161463440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 161463440 is about 12706.8265117613. The cubic root of 161463440 is about 544.5336638768.

The spelling of 161463440 in words is "one hundred sixty-one million, four hundred sixty-three thousand, four hundred forty".