54778668 has 72 divisors (see below), whose sum is σ = 151300800. Its totient is φ = 15376032.

The previous prime is 54778667. The next prime is 54778673. The reversal of 54778668 is 86687745.

It is a self number, because there is not a number n which added to its sum of digits gives 54778668.

It is not an unprimeable number, because it can be changed into a prime (54778667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33903 + ... + 35481.

It is an arithmetic number, because the mean of its divisors is an integer number (2101400).

Almost surely, 2^54778668 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 54778668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75650400).

54778668 is an abundant number, since it is smaller than the sum of its proper divisors (96522132).

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

54778668 is a wasteful number, since it uses less digits than its factorization.

54778668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659 (or 1650 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The square root of 54778668 is about 7401.2612438692. The cubic root of 54778668 is about 379.7844299023.

The spelling of 54778668 in words is "fifty-four million, seven hundred seventy-eight thousand, six hundred sixty-eight".