123456778444 has 24 divisors (see below), whose sum is σ = 223202222208. Its totient is φ = 59687992320.

The previous prime is 123456778373. The next prime is 123456778447. The reversal of 123456778444 is 444877654321.

It is a happy number.

123456778444 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×123456778444² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123456778447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258139 + ... + 559954.

It is an arithmetic number, because the mean of its divisors is an integer number (9300092592).

Almost surely, 2^123456778444 is an apocalyptic number.

It is an amenable number.

123456778444 is a deficient number, since it is larger than the sum of its proper divisors (99745443764).

123456778444 is a wasteful number, since it uses less digits than its factorization.

123456778444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819345 (or 819343 counting only the distinct ones).

The product of its digits is 18063360, while the sum is 55.

The spelling of 123456778444 in words is "one hundred twenty-three billion, four hundred fifty-six million, seven hundred seventy-eight thousand, four hundred forty-four".