128354557 has 4 divisors (see below), whose sum is σ = 135110080. Its totient is φ = 121599036.

The previous prime is 128354533. The next prime is 128354561. The reversal of 128354557 is 755453821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755453821 = 109 ⋅6930769.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128354557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128354507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3377733 + ... + 3377770.

It is an arithmetic number, because the mean of its divisors is an integer number (33777520).

Almost surely, 2^128354557 is an apocalyptic number.

It is an amenable number.

128354557 is a deficient number, since it is larger than the sum of its proper divisors (6755523).

128354557 is an equidigital number, since it uses as much as digits as its factorization.

128354557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6755522.

The product of its digits is 168000, while the sum is 40.

The square root of 128354557 is about 11329.3670167402. The cubic root of 128354557 is about 504.4333178735.

The spelling of 128354557 in words is "one hundred twenty-eight million, three hundred fifty-four thousand, five hundred fifty-seven".