64424439838 has 32 divisors (see below), whose sum is σ = 107769789792. Its totient is φ = 28637174400.

The previous prime is 64424439811. The next prime is 64424439853. The reversal of 64424439838 is 83893442446.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93420 + ... + 370912.

It is an arithmetic number, because the mean of its divisors is an integer number (3367805931).

Almost surely, 2^64424439838 is an apocalyptic number.

64424439838 is a deficient number, since it is larger than the sum of its proper divisors (43345349954).

64424439838 is a wasteful number, since it uses less digits than its factorization.

64424439838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277740.

The product of its digits is 15925248, while the sum is 55.

The spelling of 64424439838 in words is "sixty-four billion, four hundred twenty-four million, four hundred thirty-nine thousand, eight hundred thirty-eight".