123077728042 has 16 divisors (see below), whose sum is σ = 187327018440. Its totient is φ = 60641684992.

The previous prime is 123077728031. The next prime is 123077728043. The reversal of 123077728042 is 240827770321.

It can be written as a sum of positive squares in 4 ways, for example, as 97076488041 + 26001240001 = 311571^2 + 161249^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123077728042.

It is not an unprimeable number, because it can be changed into a prime (123077728043) 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, 1534867 + ... + 1613062.

Almost surely, 2^123077728042 is an apocalyptic number.

123077728042 is a deficient number, since it is larger than the sum of its proper divisors (64249290398).

123077728042 is a wasteful number, since it uses less digits than its factorization.

123077728042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148217.

The product of its (nonzero) digits is 263424, while the sum is 43.

The spelling of 123077728042 in words is "one hundred twenty-three billion, seventy-seven million, seven hundred twenty-eight thousand, forty-two".