128609534 has 8 divisors (see below), whose sum is σ = 192967488. Its totient is φ = 64287040.

The previous prime is 128609527. The next prime is 128609561. The reversal of 128609534 is 435906821.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3854 + ... + 16494.

It is an arithmetic number, because the mean of its divisors is an integer number (24120936).

Almost surely, 2^128609534 is an apocalyptic number.

128609534 is a deficient number, since it is larger than the sum of its proper divisors (64357954).

128609534 is a wasteful number, since it uses less digits than its factorization.

128609534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17730.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 128609534 is about 11340.6143572560. The cubic root of 128609534 is about 504.7671167496.

The spelling of 128609534 in words is "one hundred twenty-eight million, six hundred nine thousand, five hundred thirty-four".