648405487 has 2 divisors, whose sum is σ = 648405488. Its totient is φ = 648405486.

The previous prime is 648405469. The next prime is 648405493. The reversal of 648405487 is 784504846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648405487 - 2²³ = 640016879 is a prime.

It is a super-4 number, since 4×648405487⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648405587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324202743 + 324202744.

It is an arithmetic number, because the mean of its divisors is an integer number (324202744).

Almost surely, 2^648405487 is an apocalyptic number.

648405487 is a deficient number, since it is larger than the sum of its proper divisors (1).

648405487 is an equidigital number, since it uses as much as digits as its factorization.

648405487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 860160, while the sum is 46.

The square root of 648405487 is about 25463.8073940250. The cubic root of 648405487 is about 865.5302025274.

The spelling of 648405487 in words is "six hundred forty-eight million, four hundred five thousand, four hundred eighty-seven".