64476889929 has 27 divisors (see below), whose sum is σ = 94983148533. Its totient is φ = 42147155232.

The previous prime is 64476889909. The next prime is 64476889973. The reversal of 64476889929 is 92998867446.

The square root of 64476889929 is 253923.

It is a perfect power (a square), and thus also a powerful number.

64476889929 is a `hidden beast` number, since 64 + 476 + 8 + 8 + 9 + 92 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 548824329 + 63928065600 = 23427^2 + 252840^2 .

It is not a de Polignac number, because 64476889929 - 2²¹ = 64474792777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64476889909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 40372959 + ... + 40374555.

Almost surely, 2^64476889929 is an apocalyptic number.

64476889929 is the 253923-rd square number.

64476889929 is the 126962-nd centered octagonal number.

It is an amenable number.

64476889929 is a deficient number, since it is larger than the sum of its proper divisors (30506258604).

64476889929 is an frugal number, since it uses more digits than its factorization.

64476889929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306 (or 1653 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 72.

The spelling of 64476889929 in words is "sixty-four billion, four hundred seventy-six million, eight hundred eighty-nine thousand, nine hundred twenty-nine".