128538670 has 16 divisors (see below), whose sum is σ = 249167520. Its totient is φ = 47460384.

The previous prime is 128538661. The next prime is 128538671. The reversal of 128538670 is 76835821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128538671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494250 + ... + 494509.

It is an arithmetic number, because the mean of its divisors is an integer number (15572970).

Almost surely, 2^128538670 is an apocalyptic number.

128538670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128538670 is a deficient number, since it is larger than the sum of its proper divisors (120628850).

128538670 is a wasteful number, since it uses less digits than its factorization.

128538670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988779.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 128538670 is about 11337.4895810316. The cubic root of 128538670 is about 504.6743906310.

The spelling of 128538670 in words is "one hundred twenty-eight million, five hundred thirty-eight thousand, six hundred seventy".