55621632 has 96 divisors (see below), whose sum is σ = 161965440. Its totient is φ = 16834560.

The previous prime is 55621627. The next prime is 55621649. The reversal of 55621632 is 23612655.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 55621632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67173 + ... + 67995.

It is an arithmetic number, because the mean of its divisors is an integer number (1687140).

Almost surely, 2^55621632 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 55621632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80982720).

55621632 is an abundant number, since it is smaller than the sum of its proper divisors (106343808).

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

55621632 is a wasteful number, since it uses less digits than its factorization.

55621632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 839 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 55621632 is about 7457.9911504372. The cubic root of 55621632 is about 381.7226315430.

The spelling of 55621632 in words is "fifty-five million, six hundred twenty-one thousand, six hundred thirty-two".