649878986 has 8 divisors (see below), whose sum is σ = 974927460. Its totient is φ = 324903168.

The previous prime is 649878967. The next prime is 649879003. The reversal of 649878986 is 689878946.

It can be written as a sum of positive squares in 2 ways, for example, as 555497761 + 94381225 = 23569^2 + 9715^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 21680 + ... + 42068.

Almost surely, 2^649878986 is an apocalyptic number.

649878986 is a deficient number, since it is larger than the sum of its proper divisors (325048474).

649878986 is a wasteful number, since it uses less digits than its factorization.

649878986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36328.

The product of its digits is 41803776, while the sum is 65.

The square root of 649878986 is about 25492.7241776943. The cubic root of 649878986 is about 866.1853445383.

The spelling of 649878986 in words is "six hundred forty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-six".