630185640 has 256 divisors, whose sum is σ = 2250547200. Its totient is φ = 138184704.

The previous prime is 630185629. The next prime is 630185641. The reversal of 630185640 is 46581036.

It is not an unprimeable number, because it can be changed into a prime (630185641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2636641 + ... + 2636879.

It is an arithmetic number, because the mean of its divisors is an integer number (8791200).

Almost surely, 2^630185640 is an apocalyptic number.

630185640 is a gapful number since it is divisible by the number (60) 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 630185640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1125273600).

630185640 is an abundant number, since it is smaller than the sum of its proper divisors (1620361560).

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

630185640 is a wasteful number, since it uses less digits than its factorization.

630185640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 630185640 is about 25103.4985609576. The cubic root of 630185640 is about 857.3460821299.

The spelling of 630185640 in words is "six hundred thirty million, one hundred eighty-five thousand, six hundred forty".