3685280509 has 4 divisors (see below), whose sum is σ = 3689825440. Its totient is φ = 3680735580.

The previous prime is 3685280503. The next prime is 3685280563. The reversal of 3685280509 is 9050825863.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3685280509 - 2¹⁹ = 3684756221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685280503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2271249 + ... + 2272870.

It is an arithmetic number, because the mean of its divisors is an integer number (922456360).

Almost surely, 2^3685280509 is an apocalyptic number.

It is an amenable number.

3685280509 is a deficient number, since it is larger than the sum of its proper divisors (4544931).

3685280509 is an equidigital number, since it uses as much as digits as its factorization.

3685280509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4544930.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 3685280509 is about 60706.5112570307. The cubic root of 3685280509 is about 1544.6266255966.

The spelling of 3685280509 in words is "three billion, six hundred eighty-five million, two hundred eighty thousand, five hundred nine".