73278776634 has 64 divisors (see below), whose sum is σ = 169948736256. Its totient is φ = 20630536704.

The previous prime is 73278776633. The next prime is 73278776663. The reversal of 73278776634 is 43667787237.

It is not an unprimeable number, because it can be changed into a prime (73278776633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3414024 + ... + 3435420.

It is an arithmetic number, because the mean of its divisors is an integer number (2655449004).

Almost surely, 2^73278776634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73278776634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84974368128).

73278776634 is an abundant number, since it is smaller than the sum of its proper divisors (96669959622).

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

73278776634 is a wasteful number, since it uses less digits than its factorization.

73278776634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22599.

The product of its digits is 49787136, while the sum is 60.

The spelling of 73278776634 in words is "seventy-three billion, two hundred seventy-eight million, seven hundred seventy-six thousand, six hundred thirty-four".