131660728 has 32 divisors (see below), whose sum is σ = 260467200. Its totient is φ = 62219232.

The previous prime is 131660723. The next prime is 131660777. The reversal of 131660728 is 827066131.

It is a junction number, because it is equal to n+sod(n) for n = 131660693 and 131660702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131660723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91551 + ... + 92977.

It is an arithmetic number, because the mean of its divisors is an integer number (8139600).

Almost surely, 2^131660728 is an apocalyptic number.

It is an amenable number.

131660728 is a deficient number, since it is larger than the sum of its proper divisors (128806472).

131660728 is a wasteful number, since it uses less digits than its factorization.

131660728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2055 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 131660728 is about 11474.3508748861. The cubic root of 131660728 is about 508.7277374366.

The spelling of 131660728 in words is "one hundred thirty-one million, six hundred sixty thousand, seven hundred twenty-eight".