649999996 has 6 divisors (see below), whose sum is σ = 1137500000. Its totient is φ = 324999996.

The previous prime is 649999993. The next prime is 650000009. The reversal of 649999996 is 699999946.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 6 and 49999996 contains 649999996 itself.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649999993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81249996 + ... + 81250003.

Almost surely, 2^649999996 is an apocalyptic number.

It is an amenable number.

649999996 is a deficient number, since it is larger than the sum of its proper divisors (487500004).

649999996 is a wasteful number, since it uses less digits than its factorization.

649999996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162500003 (or 162500001 counting only the distinct ones).

The product of its digits is 76527504, while the sum is 70.

The square root of 649999996 is about 25495.0974895175. The cubic root of 649999996 is about 866.2391035640.

The spelling of 649999996 in words is "six hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-six".