781142047868 has 24 divisors (see below), whose sum is σ = 1682459796192. Its totient is φ = 309023227584.

The previous prime is 781142047853. The next prime is 781142047871. The reversal of 781142047868 is 868740241187.

It is a super-2 number, since 2×781142047868² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1072996955 + ... + 1072997682.

It is an arithmetic number, because the mean of its divisors is an integer number (70102491508).

Almost surely, 2^781142047868 is an apocalyptic number.

It is an amenable number.

781142047868 is an abundant number, since it is smaller than the sum of its proper divisors (901317748324).

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

781142047868 is a wasteful number, since it uses less digits than its factorization.

781142047868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145994661 (or 2145994659 counting only the distinct ones).

The product of its (nonzero) digits is 4816896, while the sum is 56.

The spelling of 781142047868 in words is "seven hundred eighty-one billion, one hundred forty-two million, forty-seven thousand, eight hundred sixty-eight".