5581781312 has 56 divisors (see below), whose sum is σ = 11577620736. Its totient is φ = 2665000448.

The previous prime is 5581781311. The next prime is 5581781357. The reversal of 5581781312 is 2131871855.

It is a super-2 number, since 2×5581781312² = 62312565229984882688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 5581781312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5581781311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 958313 + ... + 964119.

Almost surely, 2^5581781312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5581781312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5788810368).

5581781312 is an abundant number, since it is smaller than the sum of its proper divisors (5995839424).

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

5581781312 is a wasteful number, since it uses less digits than its factorization.

5581781312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495 (or 6485 counting only the distinct ones).

The product of its digits is 67200, while the sum is 41.

The square root of 5581781312 is about 74711.3198384288. The cubic root of 5581781312 is about 1773.8801439335.

The spelling of 5581781312 in words is "five billion, five hundred eighty-one million, seven hundred eighty-one thousand, three hundred twelve".