133663640 has 32 divisors (see below), whose sum is σ = 328084560. Its totient is φ = 48604800.

The previous prime is 133663631. The next prime is 133663643. The reversal of 133663640 is 46366331.

It is a junction number, because it is equal to n+sod(n) for n = 133663597 and 133663606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133663643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 151451 + ... + 152330.

Almost surely, 2^133663640 is an apocalyptic number.

133663640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133663640 is an abundant number, since it is smaller than the sum of its proper divisors (194420920).

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

133663640 is a wasteful number, since it uses less digits than its factorization.

133663640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303803 (or 303799 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 133663640 is about 11561.2992349476. The cubic root of 133663640 is about 511.2944689053.

The spelling of 133663640 in words is "one hundred thirty-three million, six hundred sixty-three thousand, six hundred forty".