648992444 has 12 divisors (see below), whose sum is σ = 1163437968. Its totient is φ = 316581600.

The previous prime is 648992423. The next prime is 648992489. The reversal of 648992444 is 444299846.

It is a junction number, because it is equal to n+sod(n) for n = 648992392 and 648992401.

It is a congruent number.

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, 1978472 + ... + 1978799.

It is an arithmetic number, because the mean of its divisors is an integer number (96953164).

Almost surely, 2^648992444 is an apocalyptic number.

It is an amenable number.

648992444 is a deficient number, since it is larger than the sum of its proper divisors (514445524).

648992444 is a wasteful number, since it uses less digits than its factorization.

648992444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957316 (or 3957314 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 50.

The square root of 648992444 is about 25475.3301058102. The cubic root of 648992444 is about 865.7912921304.

The spelling of 648992444 in words is "six hundred forty-eight million, nine hundred ninety-two thousand, four hundred forty-four".