649189285 has 32 divisors (see below), whose sum is σ = 853221600. Its totient is φ = 472227840.

The previous prime is 649189279. The next prime is 649189291. The reversal of 649189285 is 582981946.

It is an interprime number because it is at equal distance from previous prime (649189279) and next prime (649189291).

It can be written as a sum of positive squares in 16 ways, for example, as 247307076 + 401882209 = 15726^2 + 20047^2 .

It is not a de Polignac number, because 649189285 - 2⁵ = 649189253 is a prime.

It is a super-2 number, since 2×649189285² = 842893455517622450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379011 + ... + 380719.

It is an arithmetic number, because the mean of its divisors is an integer number (26663175).

Almost surely, 2^649189285 is an apocalyptic number.

It is an amenable number.

649189285 is a deficient number, since it is larger than the sum of its proper divisors (204032315).

649189285 is a wasteful number, since it uses less digits than its factorization.

649189285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881.

The product of its digits is 1244160, while the sum is 52.

The square root of 649189285 is about 25479.1931779639. The cubic root of 649189285 is about 865.8788154898.

The spelling of 649189285 in words is "six hundred forty-nine million, one hundred eighty-nine thousand, two hundred eighty-five".