781999012080 has 240 divisors, whose sum is σ = 3085341962976. Its totient is φ = 174992762880.

The previous prime is 781999012057. The next prime is 781999012141. The reversal of 781999012080 is 80210999187.

781999012080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×781999012080² (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 47 ways as a sum of consecutive naturals, for example, 3694627 + ... + 3900546.

Almost surely, 2^781999012080 is an apocalyptic number.

It is an amenable number.

781999012080 is an abundant number, since it is smaller than the sum of its proper divisors (2303342950896).

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

781999012080 is a wasteful number, since it uses less digits than its factorization.

781999012080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7595216 (or 7595207 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The spelling of 781999012080 in words is "seven hundred eighty-one billion, nine hundred ninety-nine million, twelve thousand, eighty".