5681387520 has 192 divisors, whose sum is σ = 20196540000. Its totient is φ = 1514962944.

The previous prime is 5681387483. The next prime is 5681387521. The reversal of 5681387520 is 257831865.

5681387520 is a `hidden beast` number, since 568 + 1 + 3 + 87 + 5 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5681387521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266206 + ... + 286754.

Almost surely, 2^5681387520 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 5681387520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10098270000).

5681387520 is an abundant number, since it is smaller than the sum of its proper divisors (14515152480).

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

5681387520 is a wasteful number, since it uses less digits than its factorization.

5681387520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20585 (or 20559 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 5681387520 is about 75374.9794029823. The cubic root of 5681387520 is about 1784.3695535037.

The spelling of 5681387520 in words is "five billion, six hundred eighty-one million, three hundred eighty-seven thousand, five hundred twenty".