5191785720 has 960 divisors, whose sum is σ = 21899354400. Its totient is φ = 1094860800.

The previous prime is 5191785691. The next prime is 5191785727. The reversal of 5191785720 is 275871915.

5191785720 is a `hidden beast` number, since 5 + 1 + 9 + 1 + 78 + 572 + 0 = 666.

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 (5191785727) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 126628900 + ... + 126628940.

Almost surely, 2^5191785720 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 5191785720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10949677200).

5191785720 is an abundant number, since it is smaller than the sum of its proper divisors (16707568680).

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

5191785720 is a wasteful number, since it uses less digits than its factorization.

5191785720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 45.

The square root of 5191785720 is about 72054.0472145736. The cubic root of 5191785720 is about 1731.5654824026.

The spelling of 5191785720 in words is "five billion, one hundred ninety-one million, seven hundred eighty-five thousand, seven hundred twenty".