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638863625324 = 22475233649381
BaseRepresentation
bin10010100101111110011…
…11010100110001101100
32021002000111121202222202
421102333033110301230
540431343042002244
61205253452401032
764104431134061
oct11227717246154
92232014552882
10638863625324
11226a38952511
12a3996176178
1348324464702
1422cc7964c68
1511941bd604e
hex94bf3d4c6c

638863625324 has 24 divisors (see below), whose sum is σ = 1142018770368. Its totient is φ = 312575166720.

The previous prime is 638863625321. The next prime is 638863625339. The reversal of 638863625324 is 423526368836.

It is a self number, because there is not a number n which added to its sum of digits gives 638863625324.

It is not an unprimeable number, because it can be changed into a prime (638863625321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659114 + ... + 1308494.

It is an arithmetic number, because the mean of its divisors is an integer number (47584115432).

Almost surely, 2638863625324 is an apocalyptic number.

It is an amenable number.

638863625324 is a deficient number, since it is larger than the sum of its proper divisors (503155145044).

638863625324 is a wasteful number, since it uses less digits than its factorization.

638863625324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654665 (or 654663 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 56.

The spelling of 638863625324 in words is "six hundred thirty-eight billion, eight hundred sixty-three million, six hundred twenty-five thousand, three hundred twenty-four".

Divisors: 1 2 4 47 94 188 5233 10466 20932 245951 491902 649381 983804 1298762 2597524 30520907 61041814 122083628 3398210773 6796421546 13592843092 159715906331 319431812662 638863625324