123128072 has 16 divisors (see below), whose sum is σ = 231258300. Its totient is φ = 61459200.

The previous prime is 123128053. The next prime is 123128099. The reversal of 123128072 is 270821321.

It can be written as a sum of positive squares in 2 ways, for example, as 88247236 + 34880836 = 9394^2 + 5906^2 .

It is a super-2 number, since 2×123128072² = 30321044228874368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7997 + ... + 17612.

Almost surely, 2^123128072 is an apocalyptic number.

It is an amenable number.

123128072 is a deficient number, since it is larger than the sum of its proper divisors (108130228).

123128072 is a wasteful number, since it uses less digits than its factorization.

123128072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26216 (or 26212 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 123128072 is about 11096.3089358579. The cubic root of 123128072 is about 497.4915322246.

Adding to 123128072 its reverse (270821321), we get a palindrome (393949393).

The spelling of 123128072 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, seventy-two".