128958387538 has 16 divisors (see below), whose sum is σ = 196736649120. Its totient is φ = 63379732000.

The previous prime is 128958387497. The next prime is 128958387553. The reversal of 128958387538 is 835783859821.

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, 1199373 + ... + 1302463.

It is an arithmetic number, because the mean of its divisors is an integer number (12296040570).

Almost surely, 2^128958387538 is an apocalyptic number.

128958387538 is a deficient number, since it is larger than the sum of its proper divisors (67778261582).

128958387538 is a wasteful number, since it uses less digits than its factorization.

128958387538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113753.

The product of its digits is 116121600, while the sum is 67.

The spelling of 128958387538 in words is "one hundred twenty-eight billion, nine hundred fifty-eight million, three hundred eighty-seven thousand, five hundred thirty-eight".