1568820840 has 128 divisors (see below), whose sum is σ = 4773150720. Its totient is φ = 412473600.

The previous prime is 1568820793. The next prime is 1568820853. The reversal of 1568820840 is 480288651.

It is a super-2 number, since 2×1568820840² = 4922397656036611200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1568820792 and 1568820801.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4739475 + ... + 4739805.

It is an arithmetic number, because the mean of its divisors is an integer number (37290240).

Almost surely, 2^1568820840 is an apocalyptic number.

1568820840 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 1568820840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386575360).

1568820840 is an abundant number, since it is smaller than the sum of its proper divisors (3204329880).

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

1568820840 is a wasteful number, since it uses less digits than its factorization.

1568820840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 1568820840 is about 39608.3430605220. The cubic root of 1568820840 is about 1161.9598359942.

The spelling of 1568820840 in words is "one billion, five hundred sixty-eight million, eight hundred twenty thousand, eight hundred forty".