781640839014 has 32 divisors (see below), whose sum is σ = 1788455302656. Its totient is φ = 223094995200.

The previous prime is 781640839009. The next prime is 781640839037. The reversal of 781640839014 is 410938046187.

It is a super-2 number, since 2×781640839014² (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 15 ways as a sum of consecutive naturals, for example, 9582187 + ... + 9663414.

It is an arithmetic number, because the mean of its divisors is an integer number (55889228208).

Almost surely, 2^781640839014 is an apocalyptic number.

781640839014 is an abundant number, since it is smaller than the sum of its proper divisors (1006814463642).

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

781640839014 is a wasteful number, since it uses less digits than its factorization.

781640839014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19246580.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 781640839014 in words is "seven hundred eighty-one billion, six hundred forty million, eight hundred thirty-nine thousand, fourteen".