64463644 has 48 divisors (see below), whose sum is σ = 133189056. Its totient is φ = 26726400.

The previous prime is 64463639. The next prime is 64463647. The reversal of 64463644 is 44636446.

64463644 is nontrivially palindromic in base 9.

It is a super-2 number, since 2×64463644² = 8311122795517472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64463647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267364 + ... + 267604.

It is an arithmetic number, because the mean of its divisors is an integer number (2774772).

Almost surely, 2^64463644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64463644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66594528).

64463644 is an abundant number, since it is smaller than the sum of its proper divisors (68725412).

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

64463644 is a wasteful number, since it uses less digits than its factorization.

64463644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526 (or 524 counting only the distinct ones).

The product of its digits is 165888, while the sum is 37.

The square root of 64463644 is about 8028.9254573697. The cubic root of 64463644 is about 400.9636018148.

It can be divided in two parts, 644636 and 44, that added together give a triangular number (644680 = T₁₁₃₅).

The spelling of 64463644 in words is "sixty-four million, four hundred sixty-three thousand, six hundred forty-four".