161575240 has 64 divisors (see below), whose sum is σ = 395928000. Its totient is φ = 59109120.

The previous prime is 161575231. The next prime is 161575277. The reversal of 161575240 is 42575161.

It is a super-2 number, since 2×161575240² = 52213116362115200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18375 + ... + 25705.

It is an arithmetic number, because the mean of its divisors is an integer number (6186375).

Almost surely, 2^161575240 is an apocalyptic number.

161575240 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 161575240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197964000).

161575240 is an abundant number, since it is smaller than the sum of its proper divisors (234352760).

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

161575240 is a wasteful number, since it uses less digits than its factorization.

161575240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7390 (or 7386 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 161575240 is about 12711.2249606401. The cubic root of 161575240 is about 544.6593163007.

The spelling of 161575240 in words is "one hundred sixty-one million, five hundred seventy-five thousand, two hundred forty".