123678004257 has 12 divisors (see below), whose sum is σ = 189154594980. Its totient is φ = 77601884928.

The previous prime is 123678004237. The next prime is 123678004279. The reversal of 123678004257 is 752400876321.

It can be written as a sum of positive squares in 2 ways, for example, as 69944909841 + 53733094416 = 264471^2 + 231804^2 .

It is not a de Polignac number, because 123678004257 - 2¹⁰ = 123678003233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123678004237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 404176332 + ... + 404176637.

It is an arithmetic number, because the mean of its divisors is an integer number (15762882915).

Almost surely, 2^123678004257 is an apocalyptic number.

123678004257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

123678004257 is a deficient number, since it is larger than the sum of its proper divisors (65476590723).

123678004257 is a wasteful number, since it uses less digits than its factorization.

123678004257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808352992 (or 808352989 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 123678004257 in words is "one hundred twenty-three billion, six hundred seventy-eight million, four thousand, two hundred fifty-seven".