180686538 has 96 divisors (see below), whose sum is σ = 427714560. Its totient is φ = 57095280.

The previous prime is 180686537. The next prime is 180686567. The reversal of 180686538 is 835686081.

It is a super-3 number, since 3×180686538³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 180686493 and 180686502.

It is not an unprimeable number, because it can be changed into a prime (180686531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1009333 + ... + 1009511.

It is an arithmetic number, because the mean of its divisors is an integer number (4455360).

Almost surely, 2^180686538 is an apocalyptic number.

180686538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 180686538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213857280).

180686538 is an abundant number, since it is smaller than the sum of its proper divisors (247028022).

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

180686538 is a wasteful number, since it uses less digits than its factorization.

180686538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 180686538 is about 13441.9692753703. The cubic root of 180686538 is about 565.3385477218.

The spelling of 180686538 in words is "one hundred eighty million, six hundred eighty-six thousand, five hundred thirty-eight".