128123788 has 12 divisors (see below), whose sum is σ = 241464160. Its totient is φ = 59134032.

The previous prime is 128123773. The next prime is 128123797. The reversal of 128123788 is 887321821.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 128123788.

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, 1231908 + ... + 1232011.

Almost surely, 2^128123788 is an apocalyptic number.

It is an amenable number.

128123788 is a deficient number, since it is larger than the sum of its proper divisors (113340372).

128123788 is a wasteful number, since it uses less digits than its factorization.

128123788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463936 (or 2463934 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The square root of 128123788 is about 11319.1778853413. The cubic root of 128123788 is about 504.1308291839.

The spelling of 128123788 in words is "one hundred twenty-eight million, one hundred twenty-three thousand, seven hundred eighty-eight".