131722780 has 72 divisors (see below), whose sum is σ = 323649648. Its totient is φ = 44900352.

The previous prime is 131722757. The next prime is 131722823. The reversal of 131722780 is 87227131.

It is a congruent number.

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, 251599 + ... + 252121.

It is an arithmetic number, because the mean of its divisors is an integer number (4495134).

Almost surely, 2^131722780 is an apocalyptic number.

131722780 is a gapful number since it is divisible by the number (10) 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 131722780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161824824).

131722780 is an abundant number, since it is smaller than the sum of its proper divisors (191926868).

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

131722780 is a wasteful number, since it uses less digits than its factorization.

131722780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 131722780 is about 11477.0545001756. The cubic root of 131722780 is about 508.8076463966.

The spelling of 131722780 in words is "one hundred thirty-one million, seven hundred twenty-two thousand, seven hundred eighty".