161240240 has 80 divisors (see below), whose sum is σ = 453667392. Its totient is φ = 52027392.

The previous prime is 161240237. The next prime is 161240279. The reversal of 161240240 is 42042161.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 1052 + ... + 17988.

Almost surely, 2^161240240 is an apocalyptic number.

161240240 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 161240240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226833696).

161240240 is an abundant number, since it is smaller than the sum of its proper divisors (292427152).

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

161240240 is a wasteful number, since it uses less digits than its factorization.

161240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16974 (or 16968 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 161240240 is about 12698.0407937603. The cubic root of 161240240 is about 544.2826349944.

The spelling of 161240240 in words is "one hundred sixty-one million, two hundred forty thousand, two hundred forty".