131798640 has 40 divisors (see below), whose sum is σ = 408576528. Its totient is φ = 35146240.

The previous prime is 131798621. The next prime is 131798657. The reversal of 131798640 is 46897131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274341 + ... + 274820.

Almost surely, 2^131798640 is an apocalyptic number.

131798640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131798640 is an abundant number, since it is smaller than the sum of its proper divisors (276777888).

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

131798640 is a wasteful number, since it uses less digits than its factorization.

131798640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549177 (or 549171 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 131798640 is about 11480.3588794079. The cubic root of 131798640 is about 508.9053028556.

The spelling of 131798640 in words is "one hundred thirty-one million, seven hundred ninety-eight thousand, six hundred forty".