1613312256 has 72 divisors (see below), whose sum is σ = 4342191840. Its totient is φ = 531705856.

The previous prime is 1613312231. The next prime is 1613312263. The reversal of 1613312256 is 6522133161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56551 + ... + 80153.

It is an arithmetic number, because the mean of its divisors is an integer number (60308220).

Almost surely, 2^1613312256 is an apocalyptic number.

1613312256 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 1613312256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171095920).

1613312256 is an abundant number, since it is smaller than the sum of its proper divisors (2728879584).

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

1613312256 is an equidigital number, since it uses as much as digits as its factorization.

1613312256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23711 (or 23697 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1613312256 is about 40166.0585071525. The cubic root of 1613312256 is about 1172.8419131266.

The spelling of 1613312256 in words is "one billion, six hundred thirteen million, three hundred twelve thousand, two hundred fifty-six".