648929644 has 24 divisors (see below), whose sum is σ = 1311741648. Its totient is φ = 277616640.

The previous prime is 648929599. The next prime is 648929669. The reversal of 648929644 is 446929846.

It is a super-2 number, since 2×648929644² = 842219365723933472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 648929591 and 648929600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433029 + ... + 434524.

It is an arithmetic number, because the mean of its divisors is an integer number (54655902).

Almost surely, 2^648929644 is an apocalyptic number.

It is an amenable number.

648929644 is an abundant number, since it is smaller than the sum of its proper divisors (662812004).

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

648929644 is a wasteful number, since it uses less digits than its factorization.

648929644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867585 (or 867583 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 52.

The square root of 648929644 is about 25474.0975110012. The cubic root of 648929644 is about 865.7633650220.

The spelling of 648929644 in words is "six hundred forty-eight million, nine hundred twenty-nine thousand, six hundred forty-four".