123195728 has 20 divisors (see below), whose sum is σ = 249070368. Its totient is φ = 58919520.

The previous prime is 123195727. The next prime is 123195763. The reversal of 123195728 is 827591321.

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 = 123195691 and 123195700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123195727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167018 + ... + 167753.

Almost surely, 2^123195728 is an apocalyptic number.

It is an amenable number.

123195728 is an abundant number, since it is smaller than the sum of its proper divisors (125874640).

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

123195728 is a wasteful number, since it uses less digits than its factorization.

123195728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334802 (or 334796 counting only the distinct ones).

The product of its digits is 30240, while the sum is 38.

The square root of 123195728 is about 11099.3570984990. The cubic root of 123195728 is about 497.5826355330.

The spelling of 123195728 in words is "one hundred twenty-three million, one hundred ninety-five thousand, seven hundred twenty-eight".