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79999987 is a prime number
BaseRepresentation
bin1001100010010…
…11001111110011
312120112102100111
410301023033303
5130434444422
611534402151
71660663054
oct461131763
9176472314
1079999987
11411811a1
1222960357
1313760392
14a8a672b
157053a77
hex4c4b3f3

79999987 has 2 divisors, whose sum is σ = 79999988. Its totient is φ = 79999986.

The previous prime is 79999981. The next prime is 80000023. The reversal of 79999987 is 78999997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79999987 - 219 = 79475699 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79999981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39999993 + 39999994.

It is an arithmetic number, because the mean of its divisors is an integer number (39999994).

Almost surely, 279999987 is an apocalyptic number.

79999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

79999987 is an equidigital number, since it uses as much as digits as its factorization.

79999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23147208, while the sum is 67.

The square root of 79999987 is about 8944.2711832770. The cubic root of 79999987 is about 430.8869146667.

The spelling of 79999987 in words is "seventy-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".