128157988 has 12 divisors (see below), whose sum is σ = 256316032. Its totient is φ = 54924840.

The previous prime is 128157979. The next prime is 128158003. The reversal of 128157988 is 889751821.

128157988 is an admirable number.

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, 2288508 + ... + 2288563.

Almost surely, 2^128157988 is an apocalyptic number.

It is an amenable number.

128157988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128157988 is a wasteful number, since it uses less digits than its factorization.

128157988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4577082 (or 4577080 counting only the distinct ones).

The product of its digits is 322560, while the sum is 49.

The square root of 128157988 is about 11320.6884949635. The cubic root of 128157988 is about 504.1756809656.

The spelling of 128157988 in words is "one hundred twenty-eight million, one hundred fifty-seven thousand, nine hundred eighty-eight".