55321992 has 96 divisors (see below), whose sum is σ = 170614080. Its totient is φ = 16030080.

The previous prime is 55321991. The next prime is 55322009. The reversal of 55321992 is 29912355.

It is a happy number.

55321992 is a `hidden beast` number, since 553 + 2 + 19 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55321991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16698 + ... + 19734.

It is an arithmetic number, because the mean of its divisors is an integer number (1777230).

Almost surely, 2^55321992 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 55321992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85307040).

55321992 is an abundant number, since it is smaller than the sum of its proper divisors (115292088).

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

55321992 is a wasteful number, since it uses less digits than its factorization.

55321992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083 (or 3076 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 55321992 is about 7437.8755031259. The cubic root of 55321992 is about 381.0359360156.

The spelling of 55321992 in words is "fifty-five million, three hundred twenty-one thousand, nine hundred ninety-two".