64128066 has 16 divisors (see below), whose sum is σ = 128669664. Its totient is φ = 21307104.

The previous prime is 64128049. The next prime is 64128073. The reversal of 64128066 is 66082146.

It is a happy number.

It is a super-2 number, since 2×64128066² = 8224817697800712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15196 + ... + 18951.

It is an arithmetic number, because the mean of its divisors is an integer number (8041854).

Almost surely, 2^64128066 is an apocalyptic number.

64128066 is an abundant number, since it is smaller than the sum of its proper divisors (64541598).

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

64128066 is a wasteful number, since it uses less digits than its factorization.

64128066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34465.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 64128066 is about 8008.0001248751. Note that the first 3 decimals coincide. The cubic root of 64128066 is about 400.2666264031.

The spelling of 64128066 in words is "sixty-four million, one hundred twenty-eight thousand, sixty-six".