1591488640 has 192 divisors, whose sum is σ = 4660502400. Its totient is φ = 516741120.

The previous prime is 1591488631. The next prime is 1591488649. The reversal of 1591488640 is 468841951.

It is an interprime number because it is at equal distance from previous prime (1591488631) and next prime (1591488649).

It is not an unprimeable number, because it can be changed into a prime (1591488649) 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 23 ways as a sum of consecutive naturals, for example, 594505 + ... + 597175.

It is an arithmetic number, because the mean of its divisors is an integer number (24273450).

Almost surely, 2^1591488640 is an apocalyptic number.

1591488640 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 1591488640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2330251200).

1591488640 is an abundant number, since it is smaller than the sum of its proper divisors (3069013760).

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

1591488640 is a wasteful number, since it uses less digits than its factorization.

1591488640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723 (or 2704 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 1591488640 is about 39893.4661316863. The cubic root of 1591488640 is about 1167.5294595534.

The spelling of 1591488640 in words is "one billion, five hundred ninety-one million, four hundred eighty-eight thousand, six hundred forty".