648906 has 24 divisors (see below), whose sum is σ = 1350720. Its totient is φ = 207792.

The previous prime is 648889. The next prime is 648911. The reversal of 648906 is 609846.

648906 = 114² + 115² + ... + 150².

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8175 + ... + 8253.

It is an arithmetic number, because the mean of its divisors is an integer number (56280).

2⁶⁴⁸⁹⁰⁶ is an apocalyptic number.

648906 is an abundant number, since it is smaller than the sum of its proper divisors (701814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648906 is a wasteful number, since it uses less digits than its factorization.

648906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 648906 is about 805.5470191119. The cubic root of 648906 is about 86.5752850088.

Subtracting from 648906 its reverse (609846), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 648906 in words is "six hundred forty-eight thousand, nine hundred six".