128215710 has 80 divisors (see below), whose sum is σ = 394026336. Its totient is φ = 29305152.

The previous prime is 128215709. The next prime is 128215793. The reversal of 128215710 is 17512821.

128215710 is a `hidden beast` number, since 12 + 82 + 1 + 571 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5637 + ... + 16976.

Almost surely, 2^128215710 is an apocalyptic number.

128215710 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128215710 is an abundant number, since it is smaller than the sum of its proper divisors (265810626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128215710 is a wasteful number, since it uses less digits than its factorization.

128215710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22639 (or 22630 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 128215710 is about 11323.2376112135. The cubic root of 128215710 is about 504.2513627109.

The spelling of 128215710 in words is "one hundred twenty-eight million, two hundred fifteen thousand, seven hundred ten".