55181632 has 56 divisors (see below), whose sum is σ = 120773952. Its totient is φ = 24806400.

The previous prime is 55181611. The next prime is 55181683. The reversal of 55181632 is 23618155.

It is a junction number, because it is equal to n+sod(n) for n = 55181594 and 55181603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72132 + ... + 72892.

Almost surely, 2^55181632 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 55181632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60386976).

55181632 is an abundant number, since it is smaller than the sum of its proper divisors (65592320).

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

55181632 is a wasteful number, since it uses less digits than its factorization.

55181632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 877 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 55181632 is about 7428.4340207072. The cubic root of 55181632 is about 380.7134150998.

Adding to 55181632 its reverse (23618155), we get a palindrome (78799787).

The spelling of 55181632 in words is "fifty-five million, one hundred eighty-one thousand, six hundred thirty-two".