128540474 has 4 divisors (see below), whose sum is σ = 192810714. Its totient is φ = 64270236.

The previous prime is 128540473. The next prime is 128540501. The reversal of 128540474 is 474045821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 119749249 + 8791225 = 10943^2 + 2965^2 .

It is a super-2 number, since 2×128540474² = 33045306912289352, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128540473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32135117 + ... + 32135120.

Almost surely, 2^128540474 is an apocalyptic number.

128540474 is a deficient number, since it is larger than the sum of its proper divisors (64270240).

128540474 is an equidigital number, since it uses as much as digits as its factorization.

128540474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64270239.

The product of its (nonzero) digits is 35840, while the sum is 35.

The square root of 128540474 is about 11337.5691398112. The cubic root of 128540474 is about 504.6767516023.

The spelling of 128540474 in words is "one hundred twenty-eight million, five hundred forty thousand, four hundred seventy-four".