128538458 has 32 divisors (see below), whose sum is σ = 207541440. Its totient is φ = 59529600.

The previous prime is 128538433. The next prime is 128538491. The reversal of 128538458 is 854835821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410510 + ... + 410822.

It is an arithmetic number, because the mean of its divisors is an integer number (6485670).

Almost surely, 2^128538458 is an apocalyptic number.

128538458 is a deficient number, since it is larger than the sum of its proper divisors (79002982).

128538458 is a wasteful number, since it uses less digits than its factorization.

128538458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

The product of its digits is 307200, while the sum is 44.

The square root of 128538458 is about 11337.4802315153. The cubic root of 128538458 is about 504.6741131762.

The spelling of 128538458 in words is "one hundred twenty-eight million, five hundred thirty-eight thousand, four hundred fifty-eight".