1644226464 has 24 divisors (see below), whose sum is σ = 4316094720. Its totient is φ = 548075456.

The previous prime is 1644226459. The next prime is 1644226469. The reversal of 1644226464 is 4646224461.

It is an interprime number because it is at equal distance from previous prime (1644226459) and next prime (1644226469).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×1644226464³ (a number of 29 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1644226469) 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 3 ways as a sum of consecutive naturals, for example, 8563584 + ... + 8563775.

It is an arithmetic number, because the mean of its divisors is an integer number (179837280).

Almost surely, 2^1644226464 is an apocalyptic number.

It is an amenable number.

1644226464 is an abundant number, since it is smaller than the sum of its proper divisors (2671868256).

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

1644226464 is a wasteful number, since it uses less digits than its factorization.

1644226464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17127372 (or 17127364 counting only the distinct ones).

The product of its digits is 221184, while the sum is 39.

The square root of 1644226464 is about 40549.0624305914. The cubic root of 1644226464 is about 1180.2858792165.

The spelling of 1644226464 in words is "one billion, six hundred forty-four million, two hundred twenty-six thousand, four hundred sixty-four".