128497906 has 16 divisors (see below), whose sum is σ = 198124416. Its totient is φ = 62474256.

The previous prime is 128497879. The next prime is 128497921. The reversal of 128497906 is 609794821.

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, 10405 + ... + 19111.

It is an arithmetic number, because the mean of its divisors is an integer number (12382776).

Almost surely, 2^128497906 is an apocalyptic number.

128497906 is a deficient number, since it is larger than the sum of its proper divisors (69626510).

128497906 is a wasteful number, since it uses less digits than its factorization.

128497906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 128497906 is about 11335.6916859978. The cubic root of 128497906 is about 504.6210351648.

The spelling of 128497906 in words is "one hundred twenty-eight million, four hundred ninety-seven thousand, nine hundred six".