133749056 has 84 divisors (see below), whose sum is σ = 320515488. Its totient is φ = 54238464.

The previous prime is 133749017. The next prime is 133749061. The reversal of 133749056 is 650947331.

It is a happy number.

It is a super-2 number, since 2×133749056² = 35777619961782272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161315 + ... + 162141.

Almost surely, 2^133749056 is an apocalyptic number.

133749056 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 133749056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160257744).

133749056 is an abundant number, since it is smaller than the sum of its proper divisors (186766432).

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

133749056 is an equidigital number, since it uses as much as digits as its factorization.

133749056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 133749056 is about 11564.9926934694. The cubic root of 133749056 is about 511.4033577271.

The spelling of 133749056 in words is "one hundred thirty-three million, seven hundred forty-nine thousand, fifty-six".