49660209 has 33 divisors (see below), whose sum is σ = 77147083. Its totient is φ = 31965192.

The previous prime is 49660207. The next prime is 49660229. The reversal of 49660209 is 90206694.

The square root of 49660209 is 7047.

It is a perfect power (a square), and thus also a powerful number.

49660209 is a `hidden beast` number, since 49 + 6 + 602 + 0 + 9 = 666.

49660209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 26040609 + 23619600 = 5103^2 + 4860^2 .

It is not a de Polignac number, because 49660209 - 2¹ = 49660207 is a prime.

It is a super-2 number, since 2×49660209² = 4932272715847362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49660201) 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 in 32 ways as a sum of consecutive naturals, for example, 1712407 + ... + 1712435.

Almost surely, 2^49660209 is an apocalyptic number.

49660209 is the 7047-th square number.

49660209 is the 3524-th centered octagonal number.

It is an amenable number.

49660209 is a deficient number, since it is larger than the sum of its proper divisors (27486874).

49660209 is an frugal number, since it uses more digits than its factorization.

49660209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 32 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The cubic root of 49660209 is about 367.5667184157.

Multiplying 49660209 by its sum of digits (36), we get a square (1787767524 = 42282²).

The spelling of 49660209 in words is "forty-nine million, six hundred sixty thousand, two hundred nine".