55995520 has 128 divisors (see below), whose sum is σ = 158630400. Its totient is φ = 18493440.

The previous prime is 55995509. The next prime is 55995521. The reversal of 55995520 is 2559955.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (55995521) 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, 129705 + ... + 130135.

It is an arithmetic number, because the mean of its divisors is an integer number (1239300).

Almost surely, 2^55995520 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 55995520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79315200).

55995520 is an abundant number, since it is smaller than the sum of its proper divisors (102634880).

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

55995520 is a wasteful number, since it uses less digits than its factorization.

55995520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 101250, while the sum is 40.

The square root of 55995520 is about 7483.0154349700. The cubic root of 55995520 is about 382.5760339828.

The spelling of 55995520 in words is "fifty-five million, nine hundred ninety-five thousand, five hundred twenty".