781263252780 has 48 divisors (see below), whose sum is σ = 2191189190400. Its totient is φ = 207989050048.

The previous prime is 781263252761. The next prime is 781263252839. The reversal of 781263252780 is 87252362187.

It is a super-2 number, since 2×781263252780² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10833054 + ... + 10904933.

It is an arithmetic number, because the mean of its divisors is an integer number (45649774800).

Almost surely, 2^781263252780 is an apocalyptic number.

It is an amenable number.

781263252780 is an abundant number, since it is smaller than the sum of its proper divisors (1409925937620).

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

781263252780 is a wasteful number, since it uses less digits than its factorization.

781263252780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21738598 (or 21738596 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 781263252780 in words is "seven hundred eighty-one billion, two hundred sixty-three million, two hundred fifty-two thousand, seven hundred eighty".