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78000050 = 25212492
BaseRepresentation
bin1001010011000…
…10111110110010
312102202210221202
410221202332302
5124432000200
611423451202
71634663252
oct451427662
9172683852
1078000050
1140035657
1222156b02
131320cc9b
14a505962
156cab1d5
hex4a62fb2

78000050 has 18 divisors (see below), whose sum is σ = 145196343. Its totient is φ = 31175040.

The previous prime is 78000049. The next prime is 78000059. The reversal of 78000050 is 5000087.

It can be written as a sum of positive squares in 5 ways, for example, as 21464689 + 56535361 = 4633^2 + 7519^2 .

It is an ABA number since it can be written as A⋅BA, here for A=2, B=6245.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 77999986 and 78000031.

It is not an unprimeable number, because it can be changed into a prime (78000059) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 61826 + ... + 63074.

Almost surely, 278000050 is an apocalyptic number.

78000050 is a deficient number, since it is larger than the sum of its proper divisors (67196293).

78000050 is an equidigital number, since it uses as much as digits as its factorization.

78000050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510 (or 1256 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 78000050 is about 8831.7636970200. The cubic root of 78000050 is about 427.2659594659.

The spelling of 78000050 in words is "seventy-eight million, fifty", and thus it is an aban number and an uban number.

Divisors: 1 2 5 10 25 50 1249 2498 6245 12490 31225 62450 1560001 3120002 7800005 15600010 39000025 78000050