17621720848 has 80 divisors (see below), whose sum is σ = 38711808000. Its totient is φ = 7726561920.

The previous prime is 17621720813. The next prime is 17621720881. The reversal of 17621720848 is 84802712671.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 17621720798 and 17621720807.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176103 + ... + 257401.

It is an arithmetic number, because the mean of its divisors is an integer number (483897600).

Almost surely, 2^17621720848 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 17621720848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19355904000).

17621720848 is an abundant number, since it is smaller than the sum of its proper divisors (21090087152).

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

17621720848 is a wasteful number, since it uses less digits than its factorization.

17621720848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81380 (or 81374 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 17621720848 in words is "seventeen billion, six hundred twenty-one million, seven hundred twenty thousand, eight hundred forty-eight".