128771512 has 64 divisors (see below), whose sum is σ = 263088000. Its totient is φ = 58898304.

The previous prime is 128771497. The next prime is 128771537. The reversal of 128771512 is 215177821.

It is a super-2 number, since 2×128771512² = 33164204605532288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 744258 + ... + 744430.

It is an arithmetic number, because the mean of its divisors is an integer number (4110750).

Almost surely, 2^128771512 is an apocalyptic number.

It is an amenable number.

128771512 is an abundant number, since it is smaller than the sum of its proper divisors (134316488).

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

128771512 is a wasteful number, since it uses less digits than its factorization.

128771512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 336 counting only the distinct ones).

The product of its digits is 7840, while the sum is 34.

The square root of 128771512 is about 11347.7536102966. The cubic root of 128771512 is about 504.9789384413.

The spelling of 128771512 in words is "one hundred twenty-eight million, seven hundred seventy-one thousand, five hundred twelve".