128701287 has 36 divisors (see below), whose sum is σ = 220080952. Its totient is φ = 71992800.

The previous prime is 128701273. The next prime is 128701291. The reversal of 128701287 is 782107821.

It is a happy number.

It is not a de Polignac number, because 128701287 - 2¹⁰ = 128700263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128701247) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9612 + ... + 18702.

Almost surely, 2^128701287 is an apocalyptic number.

128701287 is a deficient number, since it is larger than the sum of its proper divisors (91379665).

128701287 is a wasteful number, since it uses less digits than its factorization.

128701287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9132 (or 9118 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 128701287 is about 11344.6589635828. The cubic root of 128701287 is about 504.8871257059.

The spelling of 128701287 in words is "one hundred twenty-eight million, seven hundred one thousand, two hundred eighty-seven".