630221664 has 24 divisors (see below), whose sum is σ = 1654332120. Its totient is φ = 210073856.

The previous prime is 630221663. The next prime is 630221687. The reversal of 630221664 is 466122036.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630221663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3282309 + ... + 3282500.

It is an arithmetic number, because the mean of its divisors is an integer number (68930505).

Almost surely, 2^630221664 is an apocalyptic number.

It is an amenable number.

630221664 is an abundant number, since it is smaller than the sum of its proper divisors (1024110456).

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

630221664 is a wasteful number, since it uses less digits than its factorization.

630221664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564822 (or 6564814 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 630221664 is about 25104.2160602557. The cubic root of 630221664 is about 857.3624182933.

It can be divided in two parts, 6302 and 21664, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 630221664 in words is "six hundred thirty million, two hundred twenty-one thousand, six hundred sixty-four".