55387621632 has 576 divisors, whose sum is σ = 182347038720. Its totient is φ = 14592614400.

The previous prime is 55387621631. The next prime is 55387621661. The reversal of 55387621632 is 23612678355.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (55387621631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 422806207 + ... + 422806337.

It is an arithmetic number, because the mean of its divisors is an integer number (316574720).

Almost surely, 2^55387621632 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 55387621632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91173519360).

55387621632 is an abundant number, since it is smaller than the sum of its proper divisors (126959417088).

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

55387621632 is a wasteful number, since it uses less digits than its factorization.

55387621632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 276 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 48.

The spelling of 55387621632 in words is "fifty-five billion, three hundred eighty-seven million, six hundred twenty-one thousand, six hundred thirty-two".