128148987 has 16 divisors (see below), whose sum is σ = 175190400. Its totient is φ = 83278272.

The previous prime is 128148973. The next prime is 128148989. The reversal of 128148987 is 789841821.

It is not a de Polignac number, because 128148987 - 2⁴ = 128148971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128148989) 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, 121639 + ... + 122687.

It is an arithmetic number, because the mean of its divisors is an integer number (10949400).

Almost surely, 2^128148987 is an apocalyptic number.

128148987 is a deficient number, since it is larger than the sum of its proper divisors (47041413).

128148987 is a wasteful number, since it uses less digits than its factorization.

128148987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2042.

The product of its digits is 258048, while the sum is 48.

The square root of 128148987 is about 11320.2909414909. The cubic root of 128148987 is about 504.1638773275.

The spelling of 128148987 in words is "one hundred twenty-eight million, one hundred forty-eight thousand, nine hundred eighty-seven".