648340887 has 4 divisors (see below), whose sum is σ = 864454520. Its totient is φ = 432227256.

The previous prime is 648340871. The next prime is 648340921. The reversal of 648340887 is 788043846.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 648340887 - 2⁴ = 648340871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648340807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108056812 + ... + 108056817.

It is an arithmetic number, because the mean of its divisors is an integer number (216113630).

Almost surely, 2^648340887 is an apocalyptic number.

648340887 is a deficient number, since it is larger than the sum of its proper divisors (216113633).

648340887 is a wasteful number, since it uses less digits than its factorization.

648340887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216113632.

The product of its (nonzero) digits is 1032192, while the sum is 48.

The square root of 648340887 is about 25462.5388954048. The cubic root of 648340887 is about 865.5014575989.

The spelling of 648340887 in words is "six hundred forty-eight million, three hundred forty thousand, eight hundred eighty-seven".