649999997 has 8 divisors (see below), whose sum is σ = 688052640. Its totient is φ = 612990000.

The previous prime is 649999993. The next prime is 650000009. The reversal of 649999997 is 799999946.

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 649999997 - 2² = 649999993 is a prime.

It is a super-2 number, since 2×649999997² = 844999992200000018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 649999997.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 259379 + ... + 261872.

It is an arithmetic number, because the mean of its divisors is an integer number (86006580).

Almost surely, 2^649999997 is an apocalyptic number.

It is an amenable number.

649999997 is a deficient number, since it is larger than the sum of its proper divisors (38052643).

649999997 is a wasteful number, since it uses less digits than its factorization.

649999997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521323.

The product of its digits is 89282088, while the sum is 71.

The square root of 649999997 is about 25495.0975091291. The cubic root of 649999997 is about 866.2391040082.

The spelling of 649999997 in words is "six hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".