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638680226 = 2503634871
BaseRepresentation
bin100110000100010…
…111110010100010
31122111210022120012
4212010113302202
52302000231401
6143213044522
721553456322
oct4604276242
91574708505
10638680226
112a85779a8
12159a86742
13a241c7c2
1460b75282
153b10d8bb
hex26117ca2

638680226 has 8 divisors (see below), whose sum is σ = 959926464. Its totient is φ = 318704740.

The previous prime is 638680223. The next prime is 638680241. The reversal of 638680226 is 622086836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6386802262 = 815824862166822152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (638680223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316430 + ... + 318441.

It is an arithmetic number, because the mean of its divisors is an integer number (119990808).

Almost surely, 2638680226 is an apocalyptic number.

638680226 is a deficient number, since it is larger than the sum of its proper divisors (321246238).

638680226 is a wasteful number, since it uses less digits than its factorization.

638680226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635376.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 638680226 is about 25272.1234960579. The cubic root of 638680226 is about 861.1811002605.

The spelling of 638680226 in words is "six hundred thirty-eight million, six hundred eighty thousand, two hundred twenty-six".

Divisors: 1 2 503 1006 634871 1269742 319340113 638680226