128321554 has 32 divisors (see below), whose sum is σ = 216639360. Its totient is φ = 56707200.

The previous prime is 128321551. The next prime is 128321597. The reversal of 128321554 is 455123821.

It is not an unprimeable number, because it can be changed into a prime (128321551) 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, 34044 + ... + 37624.

It is an arithmetic number, because the mean of its divisors is an integer number (6769980).

Almost surely, 2^128321554 is an apocalyptic number.

128321554 is a deficient number, since it is larger than the sum of its proper divisors (88317806).

128321554 is a wasteful number, since it uses less digits than its factorization.

128321554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666.

The product of its digits is 9600, while the sum is 31.

The square root of 128321554 is about 11327.9103986569. The cubic root of 128321554 is about 504.3900802453.

The spelling of 128321554 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, five hundred fifty-four".