128867138 has 16 divisors (see below), whose sum is σ = 197783424. Its totient is φ = 62944560.

The previous prime is 128867099. The next prime is 128867143. The reversal of 128867138 is 831768821.

It is a super-2 number, since 2×128867138² = 33213478512622088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70253 + ... + 72063.

It is an arithmetic number, because the mean of its divisors is an integer number (12361464).

Almost surely, 2^128867138 is an apocalyptic number.

128867138 is a deficient number, since it is larger than the sum of its proper divisors (68916286).

128867138 is a wasteful number, since it uses less digits than its factorization.

128867138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617.

The product of its digits is 129024, while the sum is 44.

The square root of 128867138 is about 11351.9662614016. The cubic root of 128867138 is about 505.1039069920.

The spelling of 128867138 in words is "one hundred twenty-eight million, eight hundred sixty-seven thousand, one hundred thirty-eight".