55623620 has 48 divisors (see below), whose sum is σ = 126361200. Its totient is φ = 20445696.

The previous prime is 55623619. The next prime is 55623661. The reversal of 55623620 is 2632655.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 13191424 + 42432196 = 3632^2 + 6514^2 .

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, 90434 + ... + 91046.

It is an arithmetic number, because the mean of its divisors is an integer number (2632525).

Almost surely, 2^55623620 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 55623620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63180600).

55623620 is an abundant number, since it is smaller than the sum of its proper divisors (70737580).

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

55623620 is a wasteful number, since it uses less digits than its factorization.

55623620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 55623620 is about 7458.1244291041. The cubic root of 55623620 is about 381.7271792673.

The spelling of 55623620 in words is "fifty-five million, six hundred twenty-three thousand, six hundred twenty".