128006434 has 4 divisors (see below), whose sum is σ = 192009654. Its totient is φ = 64003216.

The previous prime is 128006393. The next prime is 128006441. The reversal of 128006434 is 434600821.

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., 95550625 + 32455809 = 9775^2 + 5697^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32001607 + ... + 32001610.

Almost surely, 2^128006434 is an apocalyptic number.

128006434 is a deficient number, since it is larger than the sum of its proper divisors (64003220).

128006434 is an equidigital number, since it uses as much as digits as its factorization.

128006434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64003219.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 128006434 is about 11313.9928407260. The cubic root of 128006434 is about 503.9768639123.

The spelling of 128006434 in words is "one hundred twenty-eight million, six thousand, four hundred thirty-four".