128764587 has 16 divisors (see below), whose sum is σ = 196515072. Its totient is φ = 73466400.

The previous prime is 128764567. The next prime is 128764589. The reversal of 128764587 is 785467821.

It is a de Polignac number, because none of the positive numbers 2^k-128764587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128764589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10348 + ... + 19094.

It is an arithmetic number, because the mean of its divisors is an integer number (12282192).

Almost surely, 2^128764587 is an apocalyptic number.

128764587 is a deficient number, since it is larger than the sum of its proper divisors (67750485).

128764587 is an equidigital number, since it uses as much as digits as its factorization.

128764587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9458.

The product of its digits is 752640, while the sum is 48.

The square root of 128764587 is about 11347.4484797244. The cubic root of 128764587 is about 504.9698861238.

The spelling of 128764587 in words is "one hundred twenty-eight million, seven hundred sixty-four thousand, five hundred eighty-seven".