128511312 has 20 divisors (see below), whose sum is σ = 331987680. Its totient is φ = 42837088.

The previous prime is 128511311. The next prime is 128511329. The reversal of 128511312 is 213115821.

It is a super-2 number, since 2×128511312² = 33030314623922688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128511311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338612 + ... + 1338707.

It is an arithmetic number, because the mean of its divisors is an integer number (16599384).

Almost surely, 2^128511312 is an apocalyptic number.

128511312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128511312 is an abundant number, since it is smaller than the sum of its proper divisors (203476368).

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

128511312 is a wasteful number, since it uses less digits than its factorization.

128511312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677330 (or 2677324 counting only the distinct ones).

The product of its digits is 480, while the sum is 24.

The square root of 128511312 is about 11336.2829887049. The cubic root of 128511312 is about 504.6385833479.

The spelling of 128511312 in words is "one hundred twenty-eight million, five hundred eleven thousand, three hundred twelve".