133041640 has 64 divisors (see below), whose sum is σ = 309537360. Its totient is φ = 51425280.

The previous prime is 133041617. The next prime is 133041673. The reversal of 133041640 is 46140331.

It can be written as a sum of positive squares in 8 ways, for example, as 105226564 + 27815076 = 10258^2 + 5274^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356494 + ... + 356866.

Almost surely, 2^133041640 is an apocalyptic number.

133041640 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 133041640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154768680).

133041640 is an abundant number, since it is smaller than the sum of its proper divisors (176495720).

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

133041640 is a wasteful number, since it uses less digits than its factorization.

133041640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 133041640 is about 11534.3677763456. The cubic root of 133041640 is about 510.5001373379.

Adding to 133041640 its reverse (46140331), we get a palindrome (179181971).

The spelling of 133041640 in words is "one hundred thirty-three million, forty-one thousand, six hundred forty".