128644870 has 16 divisors (see below), whose sum is σ = 239546160. Its totient is φ = 49683424.

The previous prime is 128644861. The next prime is 128644871. The reversal of 128644870 is 78446821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128644871) 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, 221512 + ... + 222091.

It is an arithmetic number, because the mean of its divisors is an integer number (14971635).

Almost surely, 2^128644870 is an apocalyptic number.

128644870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128644870 is a deficient number, since it is larger than the sum of its proper divisors (110901290).

128644870 is a wasteful number, since it uses less digits than its factorization.

128644870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443639.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 128644870 is about 11342.1721905462. The cubic root of 128644870 is about 504.8133414656.

The spelling of 128644870 in words is "one hundred twenty-eight million, six hundred forty-four thousand, eight hundred seventy".