648627994 has 12 divisors (see below), whose sum is σ = 1131789834. Its totient is φ = 277983384.

The previous prime is 648627983. The next prime is 648628003. The reversal of 648627994 is 499726846.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 488984769 + 159643225 = 22113^2 + 12635^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3309229 + ... + 3309424.

Almost surely, 2^648627994 is an apocalyptic number.

648627994 is a deficient number, since it is larger than the sum of its proper divisors (483161840).

648627994 is a wasteful number, since it uses less digits than its factorization.

648627994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6618669 (or 6618662 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The square root of 648627994 is about 25468.1761027365. The cubic root of 648627994 is about 865.6291963965.

The spelling of 648627994 in words is "six hundred forty-eight million, six hundred twenty-seven thousand, nine hundred ninety-four".