55477920 has 96 divisors (see below), whose sum is σ = 179081280. Its totient is φ = 14428160.

The previous prime is 55477913. The next prime is 55477921. The reversal of 55477920 is 2977455.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (55477921) 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, 18271 + ... + 21089.

It is an arithmetic number, because the mean of its divisors is an integer number (1865430).

Almost surely, 2^55477920 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 55477920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89540640).

55477920 is an abundant number, since it is smaller than the sum of its proper divisors (123603360).

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

55477920 is a wasteful number, since it uses less digits than its factorization.

55477920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2878 (or 2870 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 55477920 is about 7448.3501528862. The cubic root of 55477920 is about 381.3935902736.

The spelling of 55477920 in words is "fifty-five million, four hundred seventy-seven thousand, nine hundred twenty".