649893889 has 8 divisors (see below), whose sum is σ = 677777408. Its totient is φ = 622442880.

The previous prime is 649893859. The next prime is 649893899. The reversal of 649893889 is 988398946.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 649893889 - 2¹⁹ = 649369601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649893889.

It is not an unprimeable number, because it can be changed into a prime (649893809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105057 + ... + 111070.

It is an arithmetic number, because the mean of its divisors is an integer number (84722176).

Almost surely, 2^649893889 is an apocalyptic number.

It is an amenable number.

649893889 is a deficient number, since it is larger than the sum of its proper divisors (27883519).

649893889 is a wasteful number, since it uses less digits than its factorization.

649893889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216255.

The product of its digits is 26873856, while the sum is 64.

The square root of 649893889 is about 25493.0164751055. The cubic root of 649893889 is about 866.1919655973.

The spelling of 649893889 in words is "six hundred forty-nine million, eight hundred ninety-three thousand, eight hundred eighty-nine".