649507605 has 16 divisors (see below), whose sum is σ = 1039675200. Its totient is φ = 346249728.

The previous prime is 649507601. The next prime is 649507613. The reversal of 649507605 is 506705946.

It is not a de Polignac number, because 649507605 - 2² = 649507601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649507601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30546 + ... + 47244.

It is an arithmetic number, because the mean of its divisors is an integer number (64979700).

Almost surely, 2^649507605 is an apocalyptic number.

It is an amenable number.

649507605 is a deficient number, since it is larger than the sum of its proper divisors (390167595).

649507605 is a wasteful number, since it uses less digits than its factorization.

649507605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19300.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 649507605 is about 25485.4390780304. The cubic root of 649507605 is about 866.0203158264.

The spelling of 649507605 in words is "six hundred forty-nine million, five hundred seven thousand, six hundred five".