64128663 has 6 divisors (see below), whose sum is σ = 92630304. Its totient is φ = 42752436.

The previous prime is 64128653. The next prime is 64128671. The reversal of 64128663 is 36682146.

64128663 is a `hidden beast` number, since 641 + 2 + 8 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 64128663 - 2¹⁰ = 64127639 is a prime.

It is a super-2 number, since 2×64128663² = 8224970836335138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64128613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3562695 + ... + 3562712.

It is an arithmetic number, because the mean of its divisors is an integer number (15438384).

Almost surely, 2^64128663 is an apocalyptic number.

64128663 is a deficient number, since it is larger than the sum of its proper divisors (28501641).

64128663 is a wasteful number, since it uses less digits than its factorization.

64128663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7125413 (or 7125410 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 64128663 is about 8008.0374000126. The cubic root of 64128663 is about 400.2678684928.

The spelling of 64128663 in words is "sixty-four million, one hundred twenty-eight thousand, six hundred sixty-three".