64128905 has 8 divisors (see below), whose sum is σ = 76998600. Its totient is φ = 51273856.

The previous prime is 64128893. The next prime is 64128917. The reversal of 64128905 is 50982146.

64128905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64128893) and next prime (64128917).

It can be written as a sum of positive squares in 4 ways, for example, as 4700224 + 59428681 = 2168^2 + 7709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64128905 - 2¹⁶ = 64063369 is a prime.

It is a super-2 number, since 2×64128905² = 8225032912998050, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 12341 + ... + 16749.

It is an arithmetic number, because the mean of its divisors is an integer number (9624825).

Almost surely, 2^64128905 is an apocalyptic number.

It is an amenable number.

64128905 is a deficient number, since it is larger than the sum of its proper divisors (12869695).

64128905 is a wasteful number, since it uses less digits than its factorization.

64128905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7323.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 64128905 is about 8008.0525098179. The cubic root of 64128905 is about 400.2683719843.

The spelling of 64128905 in words is "sixty-four million, one hundred twenty-eight thousand, nine hundred five".