133858816 has 160 divisors (see below), whose sum is σ = 350602560. Its totient is φ = 49840128.

The previous prime is 133858811. The next prime is 133858841. The reversal of 133858816 is 618858331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133858811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7874040 + ... + 7874056.

It is an arithmetic number, because the mean of its divisors is an integer number (2191266).

Almost surely, 2^133858816 is an apocalyptic number.

133858816 is a gapful number since it is divisible by the number (16) 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 133858816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175301280).

133858816 is an abundant number, since it is smaller than the sum of its proper divisors (216743744).

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

133858816 is an frugal number, since it uses more digits than its factorization.

133858816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 39 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 133858816 is about 11569.7370756643. The cubic root of 133858816 is about 511.5432123837.

It can be divided in two parts, 13385 and 8816, that added together give a square (22201 = 149²).

The spelling of 133858816 in words is "one hundred thirty-three million, eight hundred fifty-eight thousand, eight hundred sixteen".