64128213 has 8 divisors (see below), whose sum is σ = 95004800. Its totient is φ = 42752124.

The previous prime is 64128191. The next prime is 64128217. The reversal of 64128213 is 31282146.

64128213 is a `hidden beast` number, since 641 + 2 + 8 + 2 + 13 = 666.

64128213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64128213 - 2⁸ = 64127957 is a prime.

It is a super-2 number, since 2×64128213² = 8224855405146738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2375119 = 64128213 / (6 + 4 + 1 + 2 + 8 + 2 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64128217) by changing a digit.

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, 1187533 + ... + 1187586.

It is an arithmetic number, because the mean of its divisors is an integer number (11875600).

Almost surely, 2^64128213 is an apocalyptic number.

It is an amenable number.

64128213 is a deficient number, since it is larger than the sum of its proper divisors (30876587).

64128213 is a wasteful number, since it uses less digits than its factorization.

64128213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375128 (or 2375122 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 64128213 is about 8008.0093031914. The cubic root of 64128213 is about 400.2669322450.

The spelling of 64128213 in words is "sixty-four million, one hundred twenty-eight thousand, two hundred thirteen".