55133540 has 48 divisors (see below), whose sum is σ = 144353664. Its totient is φ = 17184000.

The previous prime is 55133513. The next prime is 55133549. The reversal of 55133540 is 4533155.

It is not an unprimeable number, because it can be changed into a prime (55133549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16361 + ... + 19440.

It is an arithmetic number, because the mean of its divisors is an integer number (3007368).

Almost surely, 2^55133540 is an apocalyptic number.

It is an amenable number.

55133540 is an abundant number, since it is smaller than the sum of its proper divisors (89220124).

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

55133540 is a wasteful number, since it uses less digits than its factorization.

55133540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35828 (or 35826 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 55133540 is about 7425.1962937016. The cubic root of 55133540 is about 380.6027829296.

Adding to 55133540 its reverse (4533155), we get a palindrome (59666695).

The spelling of 55133540 in words is "fifty-five million, one hundred thirty-three thousand, five hundred forty".