123311628 has 36 divisors (see below), whose sum is σ = 340042248. Its totient is φ = 37367040.

The previous prime is 123311611. The next prime is 123311647. The reversal of 123311628 is 826113321.

It is a happy number.

123311628 is a `hidden beast` number, since 1 + 2 + 3 + 31 + 1 + 628 = 666.

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

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155301 + ... + 156092.

It is an arithmetic number, because the mean of its divisors is an integer number (9445618).

Almost surely, 2^123311628 is an apocalyptic number.

123311628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

123311628 is an abundant number, since it is smaller than the sum of its proper divisors (216730620).

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

123311628 is a wasteful number, since it uses less digits than its factorization.

123311628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311414 (or 311409 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 123311628 is about 11104.5768942360. The cubic root of 123311628 is about 497.7386251196.

Adding to 123311628 its reverse (826113321), we get a palindrome (949424949).

The spelling of 123311628 in words is "one hundred twenty-three million, three hundred eleven thousand, six hundred twenty-eight".