781001883648 has 612 divisors, whose sum is σ = 2673618763608. Its totient is φ = 218989854720.

The previous prime is 781001883631. The next prime is 781001883653. The reversal of 781001883648 is 846388100187.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 781001883594 and 781001883603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1762983715 + ... + 1762984157.

Almost surely, 2^781001883648 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 781001883648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1336809381804).

781001883648 is an abundant number, since it is smaller than the sum of its proper divisors (1892616879960).

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

781001883648 is an equidigital number, since it uses as much as digits as its factorization.

781001883648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 54.

The spelling of 781001883648 in words is "seven hundred eighty-one billion, one million, eight hundred eighty-three thousand, six hundred forty-eight".