64769479638 has 16 divisors (see below), whose sum is σ = 129574757376. Its totient is φ = 21583860200.

The previous prime is 64769479637. The next prime is 64769479651. The reversal of 64769479638 is 83697496746.

It is a super-2 number, since 2×64769479638² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64769479637) 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, 1468038 + ... + 1511513.

It is an arithmetic number, because the mean of its divisors is an integer number (8098422336).

Almost surely, 2^64769479638 is an apocalyptic number.

64769479638 is an abundant number, since it is smaller than the sum of its proper divisors (64805277738).

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

64769479638 is a wasteful number, since it uses less digits than its factorization.

64769479638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983179.

The product of its digits is 329204736, while the sum is 69.

The spelling of 64769479638 in words is "sixty-four billion, seven hundred sixty-nine million, four hundred seventy-nine thousand, six hundred thirty-eight".