64128706 has 8 divisors (see below), whose sum is σ = 96839100. Its totient is φ = 31849008.

The previous prime is 64128697. The next prime is 64128731. The reversal of 64128706 is 60782146.

It can be written as a sum of positive squares in 2 ways, for example, as 46362481 + 17766225 = 6809^2 + 4215^2 .

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

It is a super-2 number, since 2×64128706² = 8224981866468872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107301 + ... + 107896.

Almost surely, 2^64128706 is an apocalyptic number.

64128706 is a deficient number, since it is larger than the sum of its proper divisors (32710394).

64128706 is a wasteful number, since it uses less digits than its factorization.

64128706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215348.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 64128706 is about 8008.0400848148. The cubic root of 64128706 is about 400.2679579563.

The spelling of 64128706 in words is "sixty-four million, one hundred twenty-eight thousand, seven hundred six".