161704540 has 12 divisors (see below), whose sum is σ = 339579576. Its totient is φ = 64681808.

The previous prime is 161704523. The next prime is 161704549. The reversal of 161704540 is 45407161.

161704540 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161704540² = 52296716513223200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161704499 and 161704508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161704549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4042594 + ... + 4042633.

It is an arithmetic number, because the mean of its divisors is an integer number (28298298).

Almost surely, 2^161704540 is an apocalyptic number.

161704540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161704540 is an abundant number, since it is smaller than the sum of its proper divisors (177875036).

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

161704540 is a wasteful number, since it uses less digits than its factorization.

161704540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085236 (or 8085234 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 161704540 is about 12716.3099993670. The cubic root of 161704540 is about 544.8045647771.

The spelling of 161704540 in words is "one hundred sixty-one million, seven hundred four thousand, five hundred forty".