55421632 has 112 divisors (see below), whose sum is σ = 140451840. Its totient is φ = 21123072.

The previous prime is 55421621. The next prime is 55421693. The reversal of 55421632 is 23612455.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 55421632.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144513 + ... + 144895.

Almost surely, 2^55421632 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 55421632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70225920).

55421632 is an abundant number, since it is smaller than the sum of its proper divisors (85030208).

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

55421632 is a wasteful number, since it uses less digits than its factorization.

55421632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 428 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 55421632 is about 7444.5706390631. The cubic root of 55421632 is about 381.2645590785.

The spelling of 55421632 in words is "fifty-five million, four hundred twenty-one thousand, six hundred thirty-two".