64228868639 has 8 divisors (see below), whose sum is σ = 69413970192. Its totient is φ = 59078684160.

The previous prime is 64228868633. The next prime is 64228868651. The reversal of 64228868639 is 93686882246.

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 64228868639 - 2¹⁶ = 64228803103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64228868633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8725442 + ... + 8732799.

It is an arithmetic number, because the mean of its divisors is an integer number (8676746274).

Almost surely, 2^64228868639 is an apocalyptic number.

64228868639 is a deficient number, since it is larger than the sum of its proper divisors (5185101553).

64228868639 is a wasteful number, since it uses less digits than its factorization.

64228868639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17458537.

The product of its digits is 47775744, while the sum is 62.

The spelling of 64228868639 in words is "sixty-four billion, two hundred twenty-eight million, eight hundred sixty-eight thousand, six hundred thirty-nine".