123742064540 has 24 divisors (see below), whose sum is σ = 260028130992. Its totient is φ = 49464483840.

The previous prime is 123742064497. The next prime is 123742064543. The reversal of 123742064540 is 45460247321.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 123742064494 and 123742064503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123742064543) 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, 1989989 + ... + 2051228.

It is an arithmetic number, because the mean of its divisors is an integer number (10834505458).

Almost surely, 2^123742064540 is an apocalyptic number.

123742064540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123742064540 is an abundant number, since it is smaller than the sum of its proper divisors (136286066452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123742064540 is a wasteful number, since it uses less digits than its factorization.

123742064540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042757 (or 4042755 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 38.

The spelling of 123742064540 in words is "one hundred twenty-three billion, seven hundred forty-two million, sixty-four thousand, five hundred forty".