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649787380 = 225116174787
BaseRepresentation
bin100110101110101…
…111011111110100
31200021200121201021
4212232233133310
52312321144010
6144251110524
722050046564
oct4656573764
91607617637
10649787380
11303873970
12161742444
13a480b298
1462426da4
153c0a48da
hex26baf7f4

649787380 has 48 divisors (see below), whose sum is σ = 1491327936. Its totient is φ = 235854080.

The previous prime is 649787357. The next prime is 649787387. The reversal of 649787380 is 83787946.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649787387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133347 + ... + 138133.

It is an arithmetic number, because the mean of its divisors is an integer number (31069332).

Almost surely, 2649787380 is an apocalyptic number.

It is an amenable number.

649787380 is an abundant number, since it is smaller than the sum of its proper divisors (841540556).

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

649787380 is a wasteful number, since it uses less digits than its factorization.

649787380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5424 (or 5422 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 649787380 is about 25490.9274056477. The cubic root of 649787380 is about 866.1446438822.

The spelling of 649787380 in words is "six hundred forty-nine million, seven hundred eighty-seven thousand, three hundred eighty".

Divisors: 1 2 4 5 10 11 20 22 44 55 110 220 617 1234 2468 3085 4787 6170 6787 9574 12340 13574 19148 23935 27148 33935 47870 52657 67870 95740 105314 135740 210628 263285 526570 1053140 2953579 5907158 11814316 14767895 29535790 32489369 59071580 64978738 129957476 162446845 324893690 649787380