123731028 has 36 divisors (see below), whose sum is σ = 313391988. Its totient is φ = 41160960.

The previous prime is 123730987. The next prime is 123731051. The reversal of 123731028 is 820137321.

It can be written as a sum of positive squares in 2 ways, for example, as 52969284 + 70761744 = 7278^2 + 8412^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 123730992 and 123731010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16300 + ... + 22652.

It is an arithmetic number, because the mean of its divisors is an integer number (8705333).

Almost surely, 2^123731028 is an apocalyptic number.

123731028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

123731028 is an abundant number, since it is smaller than the sum of its proper divisors (189660960).

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

123731028 is a wasteful number, since it uses less digits than its factorization.

123731028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904 (or 6899 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 123731028 is about 11123.4449699722. Note that the first 3 decimals coincide. The cubic root of 123731028 is about 498.3022793469.

Adding to 123731028 its reverse (820137321), we get a palindrome (943868349).

The spelling of 123731028 in words is "one hundred twenty-three million, seven hundred thirty-one thousand, twenty-eight".