64481638 has 8 divisors (see below), whose sum is σ = 104162688. Its totient is φ = 29760744.

The previous prime is 64481633. The next prime is 64481689. The reversal of 64481638 is 83618446.

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

It is a self number, because there is not a number n which added to its sum of digits gives 64481638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64481633) 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 3 ways as a sum of consecutive naturals, for example, 1240006 + ... + 1240057.

It is an arithmetic number, because the mean of its divisors is an integer number (13020336).

Almost surely, 2^64481638 is an apocalyptic number.

64481638 is a deficient number, since it is larger than the sum of its proper divisors (39681050).

64481638 is a wasteful number, since it uses less digits than its factorization.

64481638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480078.

The product of its digits is 110592, while the sum is 40.

The square root of 64481638 is about 8030.0459525460. The cubic root of 64481638 is about 401.0009058796. Note that the first 3 decimals are identical.

The spelling of 64481638 in words is "sixty-four million, four hundred eighty-one thousand, six hundred thirty-eight".