630445664 has 48 divisors (see below), whose sum is σ = 1278281088. Its totient is φ = 305851392.

The previous prime is 630445657. The next prime is 630445721. The reversal of 630445664 is 466544036.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 730097 + ... + 730959.

It is an arithmetic number, because the mean of its divisors is an integer number (26630856).

Almost surely, 2^630445664 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 630445664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (639140544).

630445664 is an abundant number, since it is smaller than the sum of its proper divisors (647835424).

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

630445664 is a wasteful number, since it uses less digits than its factorization.

630445664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 38.

The square root of 630445664 is about 25108.6770659069. The cubic root of 630445664 is about 857.4639838449.

The spelling of 630445664 in words is "six hundred thirty million, four hundred forty-five thousand, six hundred sixty-four".