131728538 has 8 divisors (see below), whose sum is σ = 197677920. Its totient is φ = 65835900.

The previous prime is 131728537. The next prime is 131728549. The reversal of 131728538 is 835827131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (131728537) 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 3 ways as a sum of consecutive naturals, for example, 7808 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (24709740).

Almost surely, 2^131728538 is an apocalyptic number.

131728538 is a deficient number, since it is larger than the sum of its proper divisors (65949382).

131728538 is a wasteful number, since it uses less digits than its factorization.

131728538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28372.

The product of its digits is 40320, while the sum is 38.

The square root of 131728538 is about 11477.3053457682. The cubic root of 131728538 is about 508.8150601275.

The spelling of 131728538 in words is "one hundred thirty-one million, seven hundred twenty-eight thousand, five hundred thirty-eight".