133331640 has 64 divisors (see below), whose sum is σ = 430768800. Its totient is φ = 32819712.

The previous prime is 133331633. The next prime is 133331657. The reversal of 133331640 is 46133331.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 133331640.

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 15 ways as a sum of consecutive naturals, for example, 41175 + ... + 44294.

Almost surely, 2^133331640 is an apocalyptic number.

133331640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133331640 is an abundant number, since it is smaller than the sum of its proper divisors (297437160).

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

133331640 is a wasteful number, since it uses less digits than its factorization.

133331640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85496 (or 85492 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 133331640 is about 11546.9320600755. The cubic root of 133331640 is about 510.8707922244.

Adding to 133331640 its reverse (46133331), we get a palindrome (179464971).

The spelling of 133331640 in words is "one hundred thirty-three million, three hundred thirty-one thousand, six hundred forty".