649263247 has 8 divisors (see below), whose sum is σ = 653566320. Its totient is φ = 644972160.

The previous prime is 649263239. The next prime is 649263257. The reversal of 649263247 is 742362946.

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 649263247 - 2³ = 649263239 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 (649263257) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 122529 + ... + 127717.

It is an arithmetic number, because the mean of its divisors is an integer number (81695790).

Almost surely, 2^649263247 is an apocalyptic number.

649263247 is a deficient number, since it is larger than the sum of its proper divisors (4303073).

649263247 is a wasteful number, since it uses less digits than its factorization.

649263247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5993.

The product of its digits is 435456, while the sum is 43.

The square root of 649263247 is about 25480.6445562117. The cubic root of 649263247 is about 865.9116973721.

The spelling of 649263247 in words is "six hundred forty-nine million, two hundred sixty-three thousand, two hundred forty-seven".