131787684 has 72 divisors (see below), whose sum is σ = 383259968. Its totient is φ = 37402560.

The previous prime is 131787679. The next prime is 131787709. The reversal of 131787684 is 486787131.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37899 + ... + 41229.

Almost surely, 2^131787684 is an apocalyptic number.

131787684 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131787684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191629984).

131787684 is an abundant number, since it is smaller than the sum of its proper divisors (251472284).

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

131787684 is a wasteful number, since it uses less digits than its factorization.

131787684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505 (or 3500 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 131787684 is about 11479.8817067076. The cubic root of 131787684 is about 508.8912012407.

The spelling of 131787684 in words is "one hundred thirty-one million, seven hundred eighty-seven thousand, six hundred eighty-four".