649217672 has 16 divisors (see below), whose sum is σ = 1235452560. Its totient is φ = 319763664.

The previous prime is 649217659. The next prime is 649217687. The reversal of 649217672 is 276712946.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605078 + ... + 606149.

It is an arithmetic number, because the mean of its divisors is an integer number (77215785).

Almost surely, 2^649217672 is an apocalyptic number.

It is an amenable number.

649217672 is a deficient number, since it is larger than the sum of its proper divisors (586234888).

649217672 is a wasteful number, since it uses less digits than its factorization.

649217672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211300 (or 1211296 counting only the distinct ones).

The product of its digits is 254016, while the sum is 44.

The square root of 649217672 is about 25479.7502342547. The cubic root of 649217672 is about 865.8914360224.

The spelling of 649217672 in words is "six hundred forty-nine million, two hundred seventeen thousand, six hundred seventy-two".