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630640640 = 212575383
BaseRepresentation
bin100101100101101…
…101000000000000
31121221122212022202
4211211231000000
52242421000030
6142324452332
721425233310
oct4545550000
91557585282
10630640640
112a3a86713
1215724a0a8
13a0866356
145da81440
153a571745
hex2596d000

630640640 has 208 divisors, whose sum is σ = 1783410048. Its totient is φ = 209584128.

The previous prime is 630640607. The next prime is 630640663. The reversal of 630640640 is 46046036.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7598039 + ... + 7598121.

Almost surely, 2630640640 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 630640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891705024).

630640640 is an abundant number, since it is smaller than the sum of its proper divisors (1152769408).

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

630640640 is an equidigital number, since it uses as much as digits as its factorization.

630640640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 630640640 is about 25112.5594075952. The cubic root of 630640640 is about 857.5523698207.

Adding to 630640640 its reverse (46046036), we get a palindrome (676686676).

The spelling of 630640640 in words is "six hundred thirty million, six hundred forty thousand, six hundred forty".