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640635225 = 35217736883
BaseRepresentation
bin100110001011110…
…101000101011001
31122122110122022120
4212023311011121
52303000311400
6143323011453
721606211116
oct4613650531
91578418276
10640635225
112a96927aa
1215a669b89
13a29555c9
146112390d
153b397ca0
hex262f5159

640635225 has 48 divisors (see below), whose sum is σ = 1137016512. Its totient is φ = 317122560.

The previous prime is 640635211. The next prime is 640635227. The reversal of 640635225 is 522536046.

640635225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640635225 - 26 = 640635161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640635227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89634 + ... + 96516.

It is an arithmetic number, because the mean of its divisors is an integer number (23687844).

Almost surely, 2640635225 is an apocalyptic number.

It is an amenable number.

640635225 is a deficient number, since it is larger than the sum of its proper divisors (496381287).

640635225 is a wasteful number, since it uses less digits than its factorization.

640635225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6986 (or 6981 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 640635225 is about 25310.7729040423. The cubic root of 640635225 is about 862.0588964806.

The spelling of 640635225 in words is "six hundred forty million, six hundred thirty-five thousand, two hundred twenty-five".

Divisors: 1 3 5 15 17 25 51 73 75 85 219 255 365 425 1095 1241 1275 1825 3723 5475 6205 6883 18615 20649 31025 34415 93075 103245 117011 172075 351033 502459 516225 585055 1507377 1755165 2512295 2925275 7536885 8541803 8775825 12561475 25625409 37684425 42709015 128127045 213545075 640635225