67278476664 has 384 divisors, whose sum is σ = 232023744000. Its totient is φ = 17957334528.

The previous prime is 67278476651. The next prime is 67278476669. The reversal of 67278476664 is 46667487276.

It is a happy number.

67278476664 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 (63).

It is a nude number because it is divisible by every one of its digits.

Its product of digits (113799168) is a multiple of the sum of its prime factors (4704).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67278476669) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14677717 + ... + 14682299.

It is an arithmetic number, because the mean of its divisors is an integer number (604228500).

Almost surely, 2^67278476664 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 67278476664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116011872000).

67278476664 is an abundant number, since it is smaller than the sum of its proper divisors (164745267336).

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

67278476664 is a wasteful number, since it uses less digits than its factorization.

67278476664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4704 (or 4687 counting only the distinct ones).

The product of its digits is 113799168, while the sum is 63.

The spelling of 67278476664 in words is "sixty-seven billion, two hundred seventy-eight million, four hundred seventy-six thousand, six hundred sixty-four".