64891448644 has 27 divisors (see below), whose sum is σ = 124832968351. Its totient is φ = 29493565640.

The previous prime is 64891448641. The next prime is 64891448681. The reversal of 64891448644 is 44684419846.

It is a happy number.

The square root of 64891448644 is 254738.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64891448641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5598447 + ... + 5610025.

Almost surely, 2^64891448644 is an apocalyptic number.

64891448644 is the 254738-th square number.

It is an amenable number.

64891448644 is a deficient number, since it is larger than the sum of its proper divisors (59941519707).

64891448644 is an equidigital number, since it uses as much as digits as its factorization.

64891448644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23184 (or 11592 counting only the distinct ones).

The product of its digits is 21233664, while the sum is 58.

The spelling of 64891448644 in words is "sixty-four billion, eight hundred ninety-one million, four hundred forty-eight thousand, six hundred forty-four".