653944568 has 8 divisors (see below), whose sum is σ = 1226146080. Its totient is φ = 326972280.

The previous prime is 653944567. The next prime is 653944573. The reversal of 653944568 is 865449356.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653944561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40871528 + ... + 40871543.

It is an arithmetic number, because the mean of its divisors is an integer number (153268260).

Almost surely, 2^653944568 is an apocalyptic number.

It is an amenable number.

653944568 is a deficient number, since it is larger than the sum of its proper divisors (572201512).

653944568 is a wasteful number, since it uses less digits than its factorization.

653944568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81743077 (or 81743073 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 50.

The square root of 653944568 is about 25572.3399007600. The cubic root of 653944568 is about 867.9878490799.

The spelling of 653944568 in words is "six hundred fifty-three million, nine hundred forty-four thousand, five hundred sixty-eight".