128751540 has 48 divisors (see below), whose sum is σ = 381713472. Its totient is φ = 32313856.

The previous prime is 128751533. The next prime is 128751551. The reversal of 128751540 is 45157821.

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, 62094 + ... + 64133.

It is an arithmetic number, because the mean of its divisors is an integer number (7952364).

Almost surely, 2^128751540 is an apocalyptic number.

128751540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128751540 is an abundant number, since it is smaller than the sum of its proper divisors (252961932).

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

128751540 is a wasteful number, since it uses less digits than its factorization.

128751540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126256 (or 126254 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 128751540 is about 11346.8735782153. The cubic root of 128751540 is about 504.9528302836.

The spelling of 128751540 in words is "one hundred twenty-eight million, seven hundred fifty-one thousand, five hundred forty".