648555973 has 16 divisors (see below), whose sum is σ = 705367936. Its totient is φ = 592764480.

The previous prime is 648555959. The next prime is 648555983. The reversal of 648555973 is 379555846.

It is a cyclic number.

It is not a de Polignac number, because 648555973 - 2⁹ = 648555461 is a prime.

It is a super-2 number, since 2×648555973² = 841249700227953458, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 648555973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648555983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891736 + ... + 892462.

It is an arithmetic number, because the mean of its divisors is an integer number (44085496).

Almost surely, 2^648555973 is an apocalyptic number.

It is an amenable number.

648555973 is a deficient number, since it is larger than the sum of its proper divisors (56811963).

648555973 is a wasteful number, since it uses less digits than its factorization.

648555973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324.

The product of its digits is 4536000, while the sum is 52.

The square root of 648555973 is about 25466.7621224215. The cubic root of 648555973 is about 865.5971565686.

The spelling of 648555973 in words is "six hundred forty-eight million, five hundred fifty-five thousand, nine hundred seventy-three".