78664020281328 has 80 divisors (see below), whose sum is σ = 213013064791296. Its totient is φ = 24986869716480.

The previous prime is 78664020281321. The next prime is 78664020281359. The reversal of 78664020281328 is 82318202046687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78664020281321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464700900 + ... + 464870147.

Almost surely, 2^{78664020281328} is an apocalyptic number.

It is an amenable number.

78664020281328 is an abundant number, since it is smaller than the sum of its proper divisors (134349044509968).

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

78664020281328 is a wasteful number, since it uses less digits than its factorization.

78664020281328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929571142 (or 929571136 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 57.

The spelling of 78664020281328 in words is "seventy-eight trillion, six hundred sixty-four billion, twenty million, two hundred eighty-one thousand, three hundred twenty-eight".