64477647 has 16 divisors (see below), whose sum is σ = 102870880. Its totient is φ = 39678336.

The previous prime is 64477639. The next prime is 64477649. The reversal of 64477647 is 74677446.

It is not a de Polignac number, because 64477647 - 2³ = 64477639 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 (64477649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91498 + ... + 92199.

It is an arithmetic number, because the mean of its divisors is an integer number (6429430).

Almost surely, 2^64477647 is an apocalyptic number.

64477647 is a deficient number, since it is larger than the sum of its proper divisors (38393233).

64477647 is a wasteful number, since it uses less digits than its factorization.

64477647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183719 (or 183713 counting only the distinct ones).

The product of its digits is 790272, while the sum is 45.

The square root of 64477647 is about 8029.7974445188. The cubic root of 64477647 is about 400.9926325804.

The spelling of 64477647 in words is "sixty-four million, four hundred seventy-seven thousand, six hundred forty-seven".