15708993720420 has 2304 divisors, whose sum is σ = 65144550481920. Its totient is φ = 2771590348800.

The previous prime is 15708993720419. The next prime is 15708993720443. The reversal of 15708993720420 is 2402739980751.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 767 ways as a sum of consecutive naturals, for example, 50188478184 + ... + 50188478496.

It is an arithmetic number, because the mean of its divisors is an integer number (28274544480).

Almost surely, 2^{15708993720420} is an apocalyptic number.

15708993720420 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 15708993720420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32572275240960).

15708993720420 is an abundant number, since it is smaller than the sum of its proper divisors (49435556761500).

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

15708993720420 is a wasteful number, since it uses less digits than its factorization.

15708993720420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 15708993720420 in words is "fifteen trillion, seven hundred eight billion, nine hundred ninety-three million, seven hundred twenty thousand, four hundred twenty".