78838649280 has 672 divisors, whose sum is σ = 293737466880. Its totient is φ = 19358760960.

The previous prime is 78838649261. The next prime is 78838649293. The reversal of 78838649280 is 8294683887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 253500325 + ... + 253500635.

Almost surely, 2^78838649280 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 78838649280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146868733440).

78838649280 is an abundant number, since it is smaller than the sum of its proper divisors (214898817600).

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

78838649280 is a wasteful number, since it uses less digits than its factorization.

78838649280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 63.

The spelling of 78838649280 in words is "seventy-eight billion, eight hundred thirty-eight million, six hundred forty-nine thousand, two hundred eighty".