1720581696 has 224 divisors, whose sum is σ = 5503956480. Its totient is φ = 524869632.

The previous prime is 1720581673. The next prime is 1720581697. The reversal of 1720581696 is 6961850271.

1720581696 is a `hidden beast` number, since 1 + 7 + 2 + 0 + 581 + 69 + 6 = 666.

1720581696 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1720581696² = 5920802745220472832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1720581697) 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, 1086121 + ... + 1087703.

Almost surely, 2^1720581696 is an apocalyptic number.

1720581696 is a gapful number since it is divisible by the number (16) 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 1720581696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2751978240).

1720581696 is an abundant number, since it is smaller than the sum of its proper divisors (3783374784).

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

1720581696 is a wasteful number, since it uses less digits than its factorization.

1720581696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658 (or 1642 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1720581696 is about 41479.8950818345. The cubic root of 1720581696 is about 1198.2803368093.

The spelling of 1720581696 in words is "one billion, seven hundred twenty million, five hundred eighty-one thousand, six hundred ninety-six".