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18840647368 = 232355080921
BaseRepresentation
bin10001100010111111…
…010111011011001000
31210122001000001102101
4101202333113123020
5302041201203433
612353312243144
71234613601034
oct214277273310
953561001371
1018840647368
117a99066254
1237998404b4
131a1344586a
14caa3371c4
157540ae07d
hex462fd76c8

18840647368 has 8 divisors (see below), whose sum is σ = 35326213830. Its totient is φ = 9420323680.

The previous prime is 18840647351. The next prime is 18840647381. The reversal of 18840647368 is 86374604881.

It can be written as a sum of positive squares in only one way, i.e., 18835366564 + 5280804 = 137242^2 + 2298^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1177540453 + ... + 1177540468.

Almost surely, 218840647368 is an apocalyptic number.

It is an amenable number.

18840647368 is a deficient number, since it is larger than the sum of its proper divisors (16485566462).

18840647368 is a wasteful number, since it uses less digits than its factorization.

18840647368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355080927 (or 2355080923 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 18840647368 in words is "eighteen billion, eight hundred forty million, six hundred forty-seven thousand, three hundred sixty-eight".

Divisors: 1 2 4 8 2355080921 4710161842 9420323684 18840647368