128116772 has 36 divisors (see below), whose sum is σ = 274543920. Its totient is φ = 52015824.

The previous prime is 128116763. The next prime is 128116787. The reversal of 128116772 is 277611821.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13478 + ... + 20925.

It is an arithmetic number, because the mean of its divisors is an integer number (7626220).

Almost surely, 2^128116772 is an apocalyptic number.

It is an amenable number.

128116772 is an abundant number, since it is smaller than the sum of its proper divisors (146427148).

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

128116772 is a wasteful number, since it uses less digits than its factorization.

128116772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34440 (or 34431 counting only the distinct ones).

The product of its digits is 9408, while the sum is 35.

The square root of 128116772 is about 11318.8679645979. The cubic root of 128116772 is about 504.1216270248.

The spelling of 128116772 in words is "one hundred twenty-eight million, one hundred sixteen thousand, seven hundred seventy-two".