55421532 has 72 divisors (see below), whose sum is σ = 144471600. Its totient is φ = 17906688.

The previous prime is 55421503. The next prime is 55421533. The reversal of 55421532 is 23512455.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55421496 and 55421505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55421533) 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, 205894 + ... + 206162.

It is an arithmetic number, because the mean of its divisors is an integer number (2006550).

Almost surely, 2^55421532 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 55421532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72235800).

55421532 is an abundant number, since it is smaller than the sum of its proper divisors (89050068).

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

55421532 is a wasteful number, since it uses less digits than its factorization.

55421532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435 (or 430 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 55421532 is about 7444.5639227560. The cubic root of 55421532 is about 381.2643297669.

Adding to 55421532 its reverse (23512455), we get a palindrome (78933987).

The spelling of 55421532 in words is "fifty-five million, four hundred twenty-one thousand, five hundred thirty-two".