87244209 has 40 divisors (see below), whose sum is σ = 145243560. Its totient is φ = 51819264.

The previous prime is 87244207. The next prime is 87244211. The reversal of 87244209 is 90244278.

87244209 = T₅₂ + T₅₃ + ... + T₈₀₅.

It is an interprime number because it is at equal distance from previous prime (87244207) and next prime (87244211).

It can be written as a sum of positive squares in 4 ways, for example, as 7535025 + 79709184 = 2745^2 + 8928^2 .

It is not a de Polignac number, because 87244209 - 2¹ = 87244207 is a prime.

It is a super-2 number, since 2×87244209² = 15223104008071362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87244207) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 29109 + ... + 31965.

It is an arithmetic number, because the mean of its divisors is an integer number (3631089).

Almost surely, 2^87244209 is an apocalyptic number.

It is an amenable number.

87244209 is a deficient number, since it is larger than the sum of its proper divisors (57999351).

87244209 is a wasteful number, since it uses less digits than its factorization.

87244209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911 (or 2902 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 87244209 is about 9340.4608558679. The cubic root of 87244209 is about 443.5189732031.

The spelling of 87244209 in words is "eighty-seven million, two hundred forty-four thousand, two hundred nine".