128215746 has 24 divisors (see below), whose sum is σ = 280401264. Its totient is φ = 42338520.

The previous prime is 128215709. The next prime is 128215793. The reversal of 128215746 is 647512821.

128215746 is a `hidden beast` number, since 1 + 2 + 82 + 1 + 574 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128215746.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31360 + ... + 35211.

It is an arithmetic number, because the mean of its divisors is an integer number (11683386).

Almost surely, 2^128215746 is an apocalyptic number.

128215746 is an abundant number, since it is smaller than the sum of its proper divisors (152185518).

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

128215746 is a wasteful number, since it uses less digits than its factorization.

128215746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66686 (or 66683 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 128215746 is about 11323.2392008647. The cubic root of 128215746 is about 504.2514099049.

The spelling of 128215746 in words is "one hundred twenty-eight million, two hundred fifteen thousand, seven hundred forty-six".