780776095680 has 1344 divisors, whose sum is σ = 3360749184000. Its totient is φ = 162389753856.

The previous prime is 780776095669. The next prime is 780776095709. The reversal of 780776095680 is 86590677087.

780776095680 is a `hidden beast` number, since 7 + 8 + 0 + 7 + 7 + 60 + 9 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

It is a super-2 number, since 2×780776095680² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1261350411 + ... + 1261351029.

Almost surely, 2^780776095680 is an apocalyptic number.

780776095680 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 780776095680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680374592000).

780776095680 is an abundant number, since it is smaller than the sum of its proper divisors (2579973088320).

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

780776095680 is a wasteful number, since it uses less digits than its factorization.

780776095680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 63.

The spelling of 780776095680 in words is "seven hundred eighty billion, seven hundred seventy-six million, ninety-five thousand, six hundred eighty".