55821472 has 96 divisors (see below), whose sum is σ = 135209088. Its totient is φ = 22142976.

The previous prime is 55821461. The next prime is 55821473. The reversal of 55821472 is 27412855.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (55821473) 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, 407388 + ... + 407524.

It is an arithmetic number, because the mean of its divisors is an integer number (1408428).

Almost surely, 2^55821472 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 55821472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67604544).

55821472 is an abundant number, since it is smaller than the sum of its proper divisors (79387616).

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

55821472 is a wasteful number, since it uses less digits than its factorization.

55821472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 270 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

The square root of 55821472 is about 7471.3768476767. The cubic root of 55821472 is about 382.1792421074.

The spelling of 55821472 in words is "fifty-five million, eight hundred twenty-one thousand, four hundred seventy-two".