161727540 has 48 divisors (see below), whose sum is σ = 487673088. Its totient is φ = 39809664.

The previous prime is 161727509. The next prime is 161727569. The reversal of 161727540 is 45727161.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 102892 + ... + 104451.

It is an arithmetic number, because the mean of its divisors is an integer number (10159856).

Almost surely, 2^161727540 is an apocalyptic number.

161727540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161727540 is an abundant number, since it is smaller than the sum of its proper divisors (325945548).

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

161727540 is a wasteful number, since it uses less digits than its factorization.

161727540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207368 (or 207366 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 161727540 is about 12717.2143176090. The cubic root of 161727540 is about 544.8303935942.

The spelling of 161727540 in words is "one hundred sixty-one million, seven hundred twenty-seven thousand, five hundred forty".