127999979520 has 1248 divisors, whose sum is σ = 525214259136. Its totient is φ = 26424115200.

The previous prime is 127999979461. The next prime is 127999979539. The reversal of 127999979520 is 25979999721.

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, 2098360290 + ... + 2098360350.

Almost surely, 2^127999979520 is an apocalyptic number.

127999979520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 127999979520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (262607129568).

127999979520 is an abundant number, since it is smaller than the sum of its proper divisors (397214279616).

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

127999979520 is a wasteful number, since it uses less digits than its factorization.

127999979520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 57868020, while the sum is 69.

The spelling of 127999979520 in words is "one hundred twenty-seven billion, nine hundred ninety-nine million, nine hundred seventy-nine thousand, five hundred twenty".