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663391530 = 2325232943257
BaseRepresentation
bin100111100010101…
…000110100101010
31201020021210002200
4213202220310222
52324312012110
6145454441030
722303510044
oct4742506452
91636253080
10663391530
1131051596a
12166203176
13a7592489
1464168a94
153d3906c0
hex278a8d2a

663391530 has 192 divisors, whose sum is σ = 1912584960. Its totient is φ = 158957568.

The previous prime is 663391481. The next prime is 663391541. The reversal of 663391530 is 35193366.

663391530 is a `hidden beast` number, since 6 + 6 + 33 + 91 + 530 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2581162 + ... + 2581418.

It is an arithmetic number, because the mean of its divisors is an integer number (9961380).

Almost surely, 2663391530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663391530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956292480).

663391530 is an abundant number, since it is smaller than the sum of its proper divisors (1249193430).

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

663391530 is a wasteful number, since it uses less digits than its factorization.

663391530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 36.

The square root of 663391530 is about 25756.3881396441. The cubic root of 663391530 is about 872.1475679963.

The spelling of 663391530 in words is "six hundred sixty-three million, three hundred ninety-one thousand, five hundred thirty".