1591798656 has 128 divisors (see below), whose sum is σ = 4844885760. Its totient is φ = 453611520.

The previous prime is 1591798631. The next prime is 1591798667. The reversal of 1591798656 is 6568971951.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1591798656² = 5067645922486812672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1591798596 and 1591798605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1856980 + ... + 1857836.

It is an arithmetic number, because the mean of its divisors is an integer number (37850670).

Almost surely, 2^1591798656 is an apocalyptic number.

1591798656 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 1591798656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2422442880).

1591798656 is an abundant number, since it is smaller than the sum of its proper divisors (3253087104).

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

1591798656 is an equidigital number, since it uses as much as digits as its factorization.

1591798656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1560 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 57.

The square root of 1591798656 is about 39897.3514910451. The cubic root of 1591798656 is about 1167.6052647470.

The spelling of 1591798656 in words is "one billion, five hundred ninety-one million, seven hundred ninety-eight thousand, six hundred fifty-six".