64478681 has 8 divisors (see below), whose sum is σ = 65707200. Its totient is φ = 63254800.

The previous prime is 64478677. The next prime is 64478699. The reversal of 64478681 is 18687446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64478681 - 2² = 64478677 is a prime.

It is a super-2 number, since 2×64478681² = 8315000606999522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64478621) 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 7 ways as a sum of consecutive naturals, for example, 40580 + ... + 42138.

It is an arithmetic number, because the mean of its divisors is an integer number (8213400).

Almost surely, 2^64478681 is an apocalyptic number.

It is an amenable number.

64478681 is a deficient number, since it is larger than the sum of its proper divisors (1228519).

64478681 is a wasteful number, since it uses less digits than its factorization.

64478681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319.

The product of its digits is 258048, while the sum is 44.

The square root of 64478681 is about 8029.8618294464. The cubic root of 64478681 is about 400.9947760838.

The spelling of 64478681 in words is "sixty-four million, four hundred seventy-eight thousand, six hundred eighty-one".