778792897152 has 128 divisors (see below), whose sum is σ = 2377780344000. Its totient is φ = 250645957632.

The previous prime is 778792897097. The next prime is 778792897153. The reversal of 778792897152 is 251798297877.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×778792897152² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (778792897153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3785038 + ... + 3985485.

Almost surely, 2^778792897152 is an apocalyptic number.

778792897152 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

778792897152 is an abundant number, since it is smaller than the sum of its proper divisors (1598987446848).

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

778792897152 is a wasteful number, since it uses less digits than its factorization.

778792897152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7770575 (or 7770557 counting only the distinct ones).

The product of its digits is 248935680, while the sum is 72.

The spelling of 778792897152 in words is "seven hundred seventy-eight billion, seven hundred ninety-two million, eight hundred ninety-seven thousand, one hundred fifty-two".