649904158 has 8 divisors (see below), whose sum is σ = 1026164520. Its totient is φ = 307849320.

The previous prime is 649904153. The next prime is 649904173. The reversal of 649904158 is 851409946.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649904153) 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, 8551333 + ... + 8551408.

It is an arithmetic number, because the mean of its divisors is an integer number (128270565).

Almost surely, 2^649904158 is an apocalyptic number.

649904158 is a deficient number, since it is larger than the sum of its proper divisors (376260362).

649904158 is a wasteful number, since it uses less digits than its factorization.

649904158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17102762.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 649904158 is about 25493.2178824094. The cubic root of 649904158 is about 866.1965278182.

The spelling of 649904158 in words is "six hundred forty-nine million, nine hundred four thousand, one hundred fifty-eight".