649399607 has 4 divisors (see below), whose sum is σ = 660406440. Its totient is φ = 638392776.

The previous prime is 649399603. The next prime is 649399721. The reversal of 649399607 is 706993946.

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 649399607 - 2² = 649399603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649399603) 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, 5503328 + ... + 5503445.

It is an arithmetic number, because the mean of its divisors is an integer number (165101610).

Almost surely, 2^649399607 is an apocalyptic number.

649399607 is a deficient number, since it is larger than the sum of its proper divisors (11006833).

649399607 is a wasteful number, since it uses less digits than its factorization.

649399607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11006832.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The square root of 649399607 is about 25483.3201722225. The cubic root of 649399607 is about 865.9723134906.

The spelling of 649399607 in words is "six hundred forty-nine million, three hundred ninety-nine thousand, six hundred seven".