87120029 has 2 divisors, whose sum is σ = 87120030. Its totient is φ = 87120028.

The previous prime is 87119987. The next prime is 87120091. The reversal of 87120029 is 92002178.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64032004 + 23088025 = 8002^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 87120029 - 2¹² = 87115933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87119983 and 87120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87128029) by changing a digit.

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 as a sum of consecutive naturals, namely, 43560014 + 43560015.

It is an arithmetic number, because the mean of its divisors is an integer number (43560015).

Almost surely, 2^87120029 is an apocalyptic number.

It is an amenable number.

87120029 is a deficient number, since it is larger than the sum of its proper divisors (1).

87120029 is an equidigital number, since it uses as much as digits as its factorization.

87120029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 87120029 is about 9333.8110651545. The cubic root of 87120029 is about 443.3084440899.

The spelling of 87120029 in words is "eighty-seven million, one hundred twenty thousand, twenty-nine".