123778331500 has 48 divisors (see below), whose sum is σ = 270493030080. Its totient is φ = 49481817600.

The previous prime is 123778331497. The next prime is 123778331503. The reversal of 123778331500 is 5133877321.

It is an interprime number because it is at equal distance from previous prime (123778331497) and next prime (123778331503).

It is not an unprimeable number, because it can be changed into a prime (123778331503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775561 + ... + 921439.

It is an arithmetic number, because the mean of its divisors is an integer number (5635271460).

Almost surely, 2^123778331500 is an apocalyptic number.

123778331500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123778331500 is an abundant number, since it is smaller than the sum of its proper divisors (146714698580).

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

123778331500 is a wasteful number, since it uses less digits than its factorization.

123778331500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147595 (or 147583 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 123778331500 in words is "one hundred twenty-three billion, seven hundred seventy-eight million, three hundred thirty-one thousand, five hundred".