1581780096 has 512 divisors, whose sum is σ = 5654880000. Its totient is φ = 429981696.

The previous prime is 1581780017. The next prime is 1581780119. The reversal of 1581780096 is 6900871851.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14511690 + ... + 14511798.

Almost surely, 2^1581780096 is an apocalyptic number.

1581780096 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 1581780096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2827440000).

1581780096 is an abundant number, since it is smaller than the sum of its proper divisors (4073099904).

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

1581780096 is a wasteful number, since it uses less digits than its factorization.

1581780096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 1581780096 is about 39771.5991129348. The cubic root of 1581780096 is about 1165.1505257190.

The spelling of 1581780096 in words is "one billion, five hundred eighty-one million, seven hundred eighty thousand, ninety-six".