87290069 has 2 divisors, whose sum is σ = 87290070. Its totient is φ = 87290068.

The previous prime is 87290059. The next prime is 87290089. The reversal of 87290069 is 96009278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 4571044 = 9095^2 + 2138^2 .

It is a cyclic number.

It is not a de Polignac number, because 87290069 - 2²⁴ = 70512853 is a prime.

It is a super-2 number, since 2×87290069² = 15239112292049522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87290059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43645034 + 43645035.

It is an arithmetic number, because the mean of its divisors is an integer number (43645035).

Almost surely, 2^87290069 is an apocalyptic number.

It is an amenable number.

87290069 is a deficient number, since it is larger than the sum of its proper divisors (1).

87290069 is an equidigital number, since it uses as much as digits as its factorization.

87290069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 87290069 is about 9342.9154443353. The cubic root of 87290069 is about 443.5966716449.

The spelling of 87290069 in words is "eighty-seven million, two hundred ninety thousand, sixty-nine".