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78107 = 372111
BaseRepresentation
bin10011000100011011
310222010212
4103010123
54444412
61401335
7443501
oct230433
9128125
1078107
1153757
123924b
1329723
1420671
1518222
hex1311b

78107 has 4 divisors (see below), whose sum is σ = 80256. Its totient is φ = 75960.

The previous prime is 78101. The next prime is 78121. The reversal of 78107 is 70187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70187 = 135399.

It is a cyclic number.

It is not a de Polignac number, because 78107 - 214 = 61723 is a prime.

It is a super-2 number, since 2×781072 = 12201406898, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 78107.

It is not an unprimeable number, because it can be changed into a prime (78101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1019 + ... + 1092.

It is an arithmetic number, because the mean of its divisors is an integer number (20064).

278107 is an apocalyptic number.

78107 is a deficient number, since it is larger than the sum of its proper divisors (2149).

78107 is a wasteful number, since it uses less digits than its factorization.

78107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 78107 is about 279.4762959537. The cubic root of 78107 is about 42.7461152609.

The spelling of 78107 in words is "seventy-eight thousand, one hundred seven".

Divisors: 1 37 2111 78107