133215640 has 16 divisors (see below), whose sum is σ = 299735280. Its totient is φ = 53286240.

The previous prime is 133215623. The next prime is 133215661. The reversal of 133215640 is 46512331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665156 + ... + 1665235.

It is an arithmetic number, because the mean of its divisors is an integer number (18733455).

Almost surely, 2^133215640 is an apocalyptic number.

133215640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133215640 is an abundant number, since it is smaller than the sum of its proper divisors (166519640).

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

133215640 is a wasteful number, since it uses less digits than its factorization.

133215640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330402 (or 3330398 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 133215640 is about 11541.9079878502. The cubic root of 133215640 is about 510.7225948270.

Adding to 133215640 its reverse (46512331), we get a palindrome (179727971).

The spelling of 133215640 in words is "one hundred thirty-three million, two hundred fifteen thousand, six hundred forty".