647630464 has 64 divisors (see below), whose sum is σ = 1400525280. Its totient is φ = 296524800.

The previous prime is 647630461. The next prime is 647630537. The reversal of 647630464 is 464036746.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (647630461) 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, 216499 + ... + 219469.

Almost surely, 2^647630464 is an apocalyptic number.

647630464 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 647630464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700262640).

647630464 is an abundant number, since it is smaller than the sum of its proper divisors (752894816).

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

647630464 is a wasteful number, since it uses less digits than its factorization.

647630464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3129 (or 3117 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 40.

The square root of 647630464 is about 25448.5847150681. The cubic root of 647630464 is about 865.1852161102.

The spelling of 647630464 in words is "six hundred forty-seven million, six hundred thirty thousand, four hundred sixty-four".