64638464 has 80 divisors (see below), whose sum is σ = 147312000. Its totient is φ = 28047360.

The previous prime is 64638463. The next prime is 64638473. The reversal of 64638464 is 46483646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64638461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129287 + ... + 129785.

It is an arithmetic number, because the mean of its divisors is an integer number (1841400).

Almost surely, 2^64638464 is an apocalyptic number.

64638464 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64638464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73656000).

64638464 is an abundant number, since it is smaller than the sum of its proper divisors (82673536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64638464 is a wasteful number, since it uses less digits than its factorization.

64638464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 535 counting only the distinct ones).

The product of its digits is 331776, while the sum is 41.

The square root of 64638464 is about 8039.8049727590. The cubic root of 64638464 is about 401.3257345488.

The spelling of 64638464 in words is "sixty-four million, six hundred thirty-eight thousand, four hundred sixty-four".