1568720664 has 144 divisors (see below), whose sum is σ = 5030129520. Its totient is φ = 432633600.

The previous prime is 1568720663. The next prime is 1568720669. The reversal of 1568720664 is 4660278651.

1568720664 is a `hidden beast` number, since 1 + 568 + 7 + 20 + 6 + 64 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1568720663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 422014 + ... + 425714.

It is an arithmetic number, because the mean of its divisors is an integer number (34931455).

Almost surely, 2^1568720664 is an apocalyptic number.

1568720664 is a gapful number since it is divisible by the number (14) 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 1568720664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2515064760).

1568720664 is an abundant number, since it is smaller than the sum of its proper divisors (3461408856).

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

1568720664 is a wasteful number, since it uses less digits than its factorization.

1568720664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3778 (or 3742 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1568720664 is about 39607.0784582756. The cubic root of 1568720664 is about 1161.9351034131.

The spelling of 1568720664 in words is "one billion, five hundred sixty-eight million, seven hundred twenty thousand, six hundred sixty-four".