128900738 has 4 divisors (see below), whose sum is σ = 193351110. Its totient is φ = 64450368.

The previous prime is 128900719. The next prime is 128900767. The reversal of 128900738 is 837009821.

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., 85248289 + 43652449 = 9233^2 + 6607^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32225183 + ... + 32225186.

Almost surely, 2^128900738 is an apocalyptic number.

128900738 is a deficient number, since it is larger than the sum of its proper divisors (64450372).

128900738 is an equidigital number, since it uses as much as digits as its factorization.

128900738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64450371.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 128900738 is about 11353.4460847797. The cubic root of 128900738 is about 505.1478023733.

The spelling of 128900738 in words is "one hundred twenty-eight million, nine hundred thousand, seven hundred thirty-eight".