128138554 has 24 divisors (see below), whose sum is σ = 206716608. Its totient is φ = 59551680.

The previous prime is 128138539. The next prime is 128138557. The reversal of 128138554 is 455831821.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (128138557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46639 + ... + 49309.

It is an arithmetic number, because the mean of its divisors is an integer number (8613192).

Almost surely, 2^128138554 is an apocalyptic number.

128138554 is a deficient number, since it is larger than the sum of its proper divisors (78578054).

128138554 is a wasteful number, since it uses less digits than its factorization.

128138554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790 (or 2773 counting only the distinct ones).

The product of its digits is 38400, while the sum is 37.

The square root of 128138554 is about 11319.8301224002. The cubic root of 128138554 is about 504.1501951164.

The spelling of 128138554 in words is "one hundred twenty-eight million, one hundred thirty-eight thousand, five hundred fifty-four".