55405312 has 72 divisors (see below), whose sum is σ = 121413600. Its totient is φ = 25116672.

The previous prime is 55405297. The next prime is 55405313. The reversal of 55405312 is 21350455.

It is not an unprimeable number, because it can be changed into a prime (55405313) 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 7 ways as a sum of consecutive naturals, for example, 125989 + ... + 126427.

It is an arithmetic number, because the mean of its divisors is an integer number (1686300).

Almost surely, 2^55405312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55405312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60706800).

55405312 is an abundant number, since it is smaller than the sum of its proper divisors (66008288).

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

55405312 is a wasteful number, since it uses less digits than its factorization.

55405312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55405312 is about 7443.4744575366. The cubic root of 55405312 is about 381.2271317646.

Adding to 55405312 its reverse (21350455), we get a palindrome (76755767).

The spelling of 55405312 in words is "fifty-five million, four hundred five thousand, three hundred twelve".