123778612 has 12 divisors (see below), whose sum is σ = 224082180. Its totient is φ = 59755136.

The previous prime is 123778591. The next prime is 123778651. The reversal of 123778612 is 216877321.

It can be written as a sum of positive squares in 2 ways, for example, as 101082916 + 22695696 = 10054^2 + 4764^2 .

It is a super-2 number, since 2×123778612² = 30642289577293088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533413 + ... + 533644.

It is an arithmetic number, because the mean of its divisors is an integer number (18673515).

Almost surely, 2^123778612 is an apocalyptic number.

It is an amenable number.

123778612 is a deficient number, since it is larger than the sum of its proper divisors (100303568).

123778612 is a wasteful number, since it uses less digits than its factorization.

123778612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067090 (or 1067088 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 123778612 is about 11125.5836700822. The cubic root of 123778612 is about 498.3661495474.

The spelling of 123778612 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, six hundred twelve".