648693444 has 48 divisors (see below), whose sum is σ = 1745744000. Its totient is φ = 183638016.

The previous prime is 648693427. The next prime is 648693457. The reversal of 648693444 is 444396846.

It is a super-2 number, since 2×648693444² = 841606368577162272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648693393 and 648693402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26269 + ... + 44580.

Almost surely, 2^648693444 is an apocalyptic number.

It is an amenable number.

648693444 is an abundant number, since it is smaller than the sum of its proper divisors (1097050556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648693444 is a wasteful number, since it uses less digits than its factorization.

648693444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70972 (or 70970 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 48.

The square root of 648693444 is about 25469.4610072534. The cubic root of 648693444 is about 865.6583109408.

The spelling of 648693444 in words is "six hundred forty-eight million, six hundred ninety-three thousand, four hundred forty-four".