12778945440 has 48 divisors (see below), whose sum is σ = 40253679648. Its totient is φ = 3407718656.

The previous prime is 12778945433. The next prime is 12778945451. The reversal of 12778945440 is 4454987721.

It is a tau number, because it is divible by the number of its divisors (48).

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, 13310922 + ... + 13311881.

It is an arithmetic number, because the mean of its divisors is an integer number (838618326).

Almost surely, 2^12778945440 is an apocalyptic number.

12778945440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12778945440 is an abundant number, since it is smaller than the sum of its proper divisors (27474734208).

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

12778945440 is a wasteful number, since it uses less digits than its factorization.

12778945440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26622821 (or 26622813 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 12778945440 in words is "twelve billion, seven hundred seventy-eight million, nine hundred forty-five thousand, four hundred forty".