131619728 has 20 divisors (see below), whose sum is σ = 255221760. Its totient is φ = 65756064.

The previous prime is 131619727. The next prime is 131619739. The reversal of 131619728 is 827916131.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 131619691 and 131619700.

It is not an unprimeable number, because it can be changed into a prime (131619721) 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, 23153 + ... + 28271.

It is an arithmetic number, because the mean of its divisors is an integer number (12761088).

Almost surely, 2^131619728 is an apocalyptic number.

It is an amenable number.

131619728 is a deficient number, since it is larger than the sum of its proper divisors (123602032).

131619728 is a wasteful number, since it uses less digits than its factorization.

131619728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6734 (or 6728 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 131619728 is about 11472.5641423354. The cubic root of 131619728 is about 508.6749249211.

The spelling of 131619728 in words is "one hundred thirty-one million, six hundred nineteen thousand, seven hundred twenty-eight".