1720929408 has 256 divisors, whose sum is σ = 5387558400. Its totient is φ = 481075200.

The previous prime is 1720929361. The next prime is 1720929409. The reversal of 1720929408 is 8049290271.

It is a self number, because there is not a number n which added to its sum of digits gives 1720929408.

It is not an unprimeable number, because it can be changed into a prime (1720929409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3290235 + ... + 3290757.

It is an arithmetic number, because the mean of its divisors is an integer number (21045150).

Almost surely, 2^1720929408 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 1720929408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2693779200).

1720929408 is an abundant number, since it is smaller than the sum of its proper divisors (3666628992).

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

1720929408 is a wasteful number, since it uses less digits than its factorization.

1720929408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 599 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1720929408 is about 41484.0862018196. The cubic root of 1720929408 is about 1198.3610514477.

The spelling of 1720929408 in words is "one billion, seven hundred twenty million, nine hundred twenty-nine thousand, four hundred eight".