648864427 has 2 divisors, whose sum is σ = 648864428. Its totient is φ = 648864426.

The previous prime is 648864373. The next prime is 648864443. The reversal of 648864427 is 724468846.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648864427 - 2¹⁹ = 648340139 is a prime.

It is not a weakly prime, because it can be changed into another prime (648864127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324432213 + 324432214.

It is an arithmetic number, because the mean of its divisors is an integer number (324432214).

Almost surely, 2^648864427 is an apocalyptic number.

648864427 is a deficient number, since it is larger than the sum of its proper divisors (1).

648864427 is an equidigital number, since it uses as much as digits as its factorization.

648864427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2064384, while the sum is 49.

The square root of 648864427 is about 25472.8174138630. The cubic root of 648864427 is about 865.7343611685.

The spelling of 648864427 in words is "six hundred forty-eight million, eight hundred sixty-four thousand, four hundred twenty-seven".