133640550 has 48 divisors (see below), whose sum is σ = 368257680. Its totient is φ = 35637120.

The previous prime is 133640537. The next prime is 133640609. The reversal of 133640550 is 55046331.

133640550 is a `hidden beast` number, since 13 + 3 + 640 + 5 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 23 ways as a sum of consecutive naturals, for example, 48147 + ... + 50846.

It is an arithmetic number, because the mean of its divisors is an integer number (7672035).

Almost surely, 2^133640550 is an apocalyptic number.

133640550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

133640550 is an abundant number, since it is smaller than the sum of its proper divisors (234617130).

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

133640550 is a wasteful number, since it uses less digits than its factorization.

133640550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99014 (or 99003 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 133640550 is about 11560.3006016280. The cubic root of 133640550 is about 511.2650256721.

Adding to 133640550 its reverse (55046331), we get a palindrome (188686881).

The spelling of 133640550 in words is "one hundred thirty-three million, six hundred forty thousand, five hundred fifty".