128227557 has 8 divisors (see below), whose sum is σ = 171256960. Its totient is φ = 85341600.

The previous prime is 128227543. The next prime is 128227573. The reversal of 128227557 is 755722821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128227557 - 2²² = 124033253 is a prime.

It is a super-3 number, since 3×128227557³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128227537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33757 + ... + 37362.

It is an arithmetic number, because the mean of its divisors is an integer number (21407120).

Almost surely, 2^128227557 is an apocalyptic number.

It is an amenable number.

128227557 is a deficient number, since it is larger than the sum of its proper divisors (43029403).

128227557 is an equidigital number, since it uses as much as digits as its factorization.

128227557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71723.

The product of its digits is 78400, while the sum is 39.

The square root of 128227557 is about 11323.7607268963. The cubic root of 128227557 is about 504.2668930020.

The spelling of 128227557 in words is "one hundred twenty-eight million, two hundred twenty-seven thousand, five hundred fifty-seven".