54621666 has 48 divisors (see below), whose sum is σ = 130908960. Its totient is φ = 16320960.

The previous prime is 54621643. The next prime is 54621667. The reversal of 54621666 is 66612645.

It is a happy number.

54621666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 54621666.

It is not an unprimeable number, because it can be changed into a prime (54621667) 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, 12565 + ... + 16343.

It is an arithmetic number, because the mean of its divisors is an integer number (2727270).

Almost surely, 2^54621666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 54621666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65454480).

54621666 is an abundant number, since it is smaller than the sum of its proper divisors (76287294).

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

54621666 is a wasteful number, since it uses less digits than its factorization.

54621666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3871 (or 3868 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 54621666 is about 7390.6471976411. The cubic root of 54621666 is about 379.4212473351.

The spelling of 54621666 in words is "fifty-four million, six hundred twenty-one thousand, six hundred sixty-six".