781132486464 has 1260 divisors, whose sum is σ = 2810975896960. Its totient is φ = 214045286400.

The previous prime is 781132486457. The next prime is 781132486469. The reversal of 781132486464 is 464684231187.

781132486464 is a `hidden beast` number, since 7 + 8 + 1 + 132 + 48 + 6 + 464 = 666.

It is a super-2 number, since 2×781132486464² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 781132486464.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781132486469) by changing a digit.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 5619658107 + ... + 5619658245.

Almost surely, 2^781132486464 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 781132486464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1405487948480).

781132486464 is an abundant number, since it is smaller than the sum of its proper divisors (2029843410496).

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

781132486464 is a wasteful number, since it uses less digits than its factorization.

781132486464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 203 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 781132486464 in words is "seven hundred eighty-one billion, one hundred thirty-two million, four hundred eighty-six thousand, four hundred sixty-four".