161440880 has 40 divisors (see below), whose sum is σ = 376127712. Its totient is φ = 64442624.

The previous prime is 161440871. The next prime is 161440907. The reversal of 161440880 is 88044161.

161440880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42749 + ... + 46371.

Almost surely, 2^161440880 is an apocalyptic number.

161440880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161440880 is an abundant number, since it is smaller than the sum of its proper divisors (214686832).

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

161440880 is a wasteful number, since it uses less digits than its factorization.

161440880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193 (or 4187 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 161440880 is about 12705.9387689379. The cubic root of 161440880 is about 544.5083015787.

The spelling of 161440880 in words is "one hundred sixty-one million, four hundred forty thousand, eight hundred eighty".