123456778 has 16 divisors (see below), whose sum is σ = 193473216. Its totient is φ = 58972320.

The previous prime is 123456761. The next prime is 123456791. The reversal of 123456778 is 877654321.

It is a plaindrome in base 10.

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, 69550 + ... + 71302.

It is an arithmetic number, because the mean of its divisors is an integer number (12092076).

Almost surely, 2^123456778 is an apocalyptic number.

123456778 is a deficient number, since it is larger than the sum of its proper divisors (70016438).

123456778 is a wasteful number, since it uses less digits than its factorization.

123456778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309.

The product of its digits is 282240, while the sum is 43.

The square root of 123456778 is about 11111.1105655555. The cubic root of 123456778 is about 497.9338444295.

The spelling of 123456778 in words is "one hundred twenty-three million, four hundred fifty-six thousand, seven hundred seventy-eight".