133531860 has 144 divisors (see below), whose sum is σ = 474586560. Its totient is φ = 27740160.

The previous prime is 133531847. The next prime is 133531861. The reversal of 133531860 is 68135331.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133531861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30276 + ... + 34404.

It is an arithmetic number, because the mean of its divisors is an integer number (3295740).

Almost surely, 2^133531860 is an apocalyptic number.

133531860 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 133531860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237293280).

133531860 is an abundant number, since it is smaller than the sum of its proper divisors (341054700).

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

133531860 is a wasteful number, since it uses less digits than its factorization.

133531860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166 (or 4157 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 133531860 is about 11555.5986430821. The cubic root of 133531860 is about 511.1263839517.

The spelling of 133531860 in words is "one hundred thirty-three million, five hundred thirty-one thousand, eight hundred sixty".