648890 has 32 divisors (see below), whose sum is σ = 1353024. Its totient is φ = 221440.

The previous prime is 648889. The next prime is 648911. The reversal of 648890 is 98846.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 648890.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1697 + ... + 2043.

It is an arithmetic number, because the mean of its divisors is an integer number (42282).

2⁶⁴⁸⁸⁹⁰ is an apocalyptic number.

648890 is an abundant number, since it is smaller than the sum of its proper divisors (704134).

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

648890 is a wasteful number, since it uses less digits than its factorization.

648890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 648890 is about 805.5370879109. The cubic root of 648890 is about 86.5745734440.

The spelling of 648890 in words is "six hundred forty-eight thousand, eight hundred ninety".