64478693 has 4 divisors (see below), whose sum is σ = 64512768. Its totient is φ = 64444620.

The previous prime is 64478677. The next prime is 64478699. The reversal of 64478693 is 39687446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64478693 - 2⁴ = 64478677 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 (64478699) 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 3 ways as a sum of consecutive naturals, for example, 14021 + ... + 18042.

It is an arithmetic number, because the mean of its divisors is an integer number (16128192).

Almost surely, 2^64478693 is an apocalyptic number.

It is an amenable number.

64478693 is a deficient number, since it is larger than the sum of its proper divisors (34075).

64478693 is a wasteful number, since it uses less digits than its factorization.

64478693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34074.

The product of its digits is 870912, while the sum is 47.

The square root of 64478693 is about 8029.8625766572. The cubic root of 64478693 is about 400.9948009600.

The spelling of 64478693 in words is "sixty-four million, four hundred seventy-eight thousand, six hundred ninety-three".