648999 has 24 divisors (see below), whose sum is σ = 1060080. Its totient is φ = 390096.

The previous prime is 648997. The next prime is 649001. The reversal of 648999 is 999846.

648999 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (648997) and next prime (649001).

It is not a de Polignac number, because 648999 - 2¹ = 648997 is a prime.

It is an Ulam number.

Its product of digits (139968) is a multiple of the sum of its prime factors (108).

648999 is a modest number, since divided by 999 gives 648 as remainder.

648999 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15072 + ... + 15114.

It is an arithmetic number, because the mean of its divisors is an integer number (44170).

2⁶⁴⁸⁹⁹⁹ is an apocalyptic number.

648999 is a deficient number, since it is larger than the sum of its proper divisors (411081).

648999 is a wasteful number, since it uses less digits than its factorization.

648999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 59 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 648999 is about 805.6047417934. The cubic root of 648999 is about 86.5794207474.

It can be divided in two parts, 6489 and 99, that multiplied together give a triangular number (642411 = T₁₁₃₃).

The spelling of 648999 in words is "six hundred forty-eight thousand, nine hundred ninety-nine".