55651572 has 72 divisors (see below), whose sum is σ = 148442112. Its totient is φ = 17553600.

The previous prime is 55651571. The next prime is 55651601. The reversal of 55651572 is 27515655.

It is a happy number.

55651572 is a `hidden beast` number, since 556 + 51 + 57 + 2 = 666.

55651572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55651571) 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 23 ways as a sum of consecutive naturals, for example, 51922 + ... + 52982.

It is an arithmetic number, because the mean of its divisors is an integer number (2061696).

Almost surely, 2^55651572 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 55651572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74221056).

55651572 is an abundant number, since it is smaller than the sum of its proper divisors (92790540).

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

55651572 is a wasteful number, since it uses less digits than its factorization.

55651572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1144 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 55651572 is about 7459.9981233242. The cubic root of 55651572 is about 381.7911104492.

The spelling of 55651572 in words is "fifty-five million, six hundred fifty-one thousand, five hundred seventy-two".