55021960 has 128 divisors (see below), whose sum is σ = 149713920. Its totient is φ = 17805312.

The previous prime is 55021949. The next prime is 55021969. The reversal of 55021960 is 6912055.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (55021969) 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 31 ways as a sum of consecutive naturals, for example, 486864 + ... + 486976.

It is an arithmetic number, because the mean of its divisors is an integer number (1169640).

Almost surely, 2^55021960 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 55021960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74856960).

55021960 is an abundant number, since it is smaller than the sum of its proper divisors (94691960).

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

55021960 is a wasteful number, since it uses less digits than its factorization.

55021960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 55021960 is about 7417.6788822380. The cubic root of 55021960 is about 380.3458531814.

The spelling of 55021960 in words is "fifty-five million, twenty-one thousand, nine hundred sixty".