55455920 has 40 divisors (see below), whose sum is σ = 138855696. Its totient is φ = 20475648.

The previous prime is 55455919. The next prime is 55455923. The reversal of 55455920 is 2955455.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (55455923) 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, 25622 + ... + 27701.

Almost surely, 2^55455920 is an apocalyptic number.

It is an amenable number.

55455920 is an abundant number, since it is smaller than the sum of its proper divisors (83399776).

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

55455920 is a wasteful number, since it uses less digits than its factorization.

55455920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53349 (or 53343 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

The square root of 55455920 is about 7446.8731693242. The cubic root of 55455920 is about 381.3431692031.

The spelling of 55455920 in words is "fifty-five million, four hundred fifty-five thousand, nine hundred twenty".