128660402 has 16 divisors (see below), whose sum is σ = 208557720. Its totient is φ = 59175552.

The previous prime is 128660393. The next prime is 128660431. The reversal of 128660402 is 204066821.

It can be written as a sum of positive squares in 4 ways, for example, as 86136961 + 42523441 = 9281^2 + 6521^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827 + ... + 16062.

Almost surely, 2^128660402 is an apocalyptic number.

128660402 is a deficient number, since it is larger than the sum of its proper divisors (79897318).

128660402 is a wasteful number, since it uses less digits than its factorization.

128660402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17197.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 128660402 is about 11342.8568711767. The cubic root of 128660402 is about 504.8336569415.

The spelling of 128660402 in words is "one hundred twenty-eight million, six hundred sixty thousand, four hundred two".