649628619 has 4 divisors (see below), whose sum is σ = 866171496. Its totient is φ = 433085744.

The previous prime is 649628597. The next prime is 649628621. The reversal of 649628619 is 916826946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 649628619 - 2¹⁹ = 649104331 is a prime.

It is a super-2 number, since 2×649628619² = 844034685247694322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649628669) 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, 108271434 + ... + 108271439.

It is an arithmetic number, because the mean of its divisors is an integer number (216542874).

Almost surely, 2^649628619 is an apocalyptic number.

649628619 is a deficient number, since it is larger than the sum of its proper divisors (216542877).

649628619 is a wasteful number, since it uses less digits than its factorization.

649628619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216542876.

The product of its digits is 1119744, while the sum is 51.

The square root of 649628619 is about 25487.8131466786. The cubic root of 649628619 is about 866.0740971184.

The spelling of 649628619 in words is "six hundred forty-nine million, six hundred twenty-eight thousand, six hundred nineteen".