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638591996 = 22722806857
BaseRepresentation
bin100110000100000…
…010001111111100
31122111121211112102
4212010002033330
52301434420441
6143211124232
721552641150
oct4604021774
91574554472
10638591996
112a8517689
12159a43678
13a23bb5b3
1460b51060
153b0e269b
hex261023fc

638591996 has 12 divisors (see below), whose sum is σ = 1277184048. Its totient is φ = 273682272.

The previous prime is 638591983. The next prime is 638592001. The reversal of 638591996 is 699195836.

638591996 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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, 11403401 + ... + 11403456.

It is an arithmetic number, because the mean of its divisors is an integer number (106432004).

Almost surely, 2638591996 is an apocalyptic number.

It is an amenable number.

638591996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

638591996 is a wasteful number, since it uses less digits than its factorization.

638591996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22806868 (or 22806866 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 56.

The square root of 638591996 is about 25270.3778365105. The cubic root of 638591996 is about 861.1414426956.

The spelling of 638591996 in words is "six hundred thirty-eight million, five hundred ninety-one thousand, nine hundred ninety-six".

Divisors: 1 2 4 7 14 28 22806857 45613714 91227428 159647999 319295998 638591996