128992087 has 16 divisors (see below), whose sum is σ = 153426240. Its totient is φ = 106106112.

The previous prime is 128992067. The next prime is 128992093. The reversal of 128992087 is 780299821.

It is not a de Polignac number, because 128992087 - 2¹⁹ = 128467799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128992037) 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, 33283 + ... + 36955.

It is an arithmetic number, because the mean of its divisors is an integer number (9589140).

Almost surely, 2^128992087 is an apocalyptic number.

128992087 is a deficient number, since it is larger than the sum of its proper divisors (24434153).

128992087 is a wasteful number, since it uses less digits than its factorization.

128992087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3882.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 128992087 is about 11357.4683358572. The cubic root of 128992087 is about 505.2671030875.

The spelling of 128992087 in words is "one hundred twenty-eight million, nine hundred ninety-two thousand, eighty-seven".