648081 has 28 divisors (see below), whose sum is σ = 1119232. Its totient is φ = 367416.

The previous prime is 648079. The next prime is 648097. The reversal of 648081 is 180846.

648081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 648081 - 2¹ = 648079 is a prime.

It is a super-2 number, since 2×648081² = 840017965122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648081.

It is not an unprimeable number, because it can be changed into a prime (648041) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5040 + ... + 5166.

2⁶⁴⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

648081 is a deficient number, since it is larger than the sum of its proper divisors (471151).

648081 is an equidigital number, since it uses as much as digits as its factorization.

648081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 648081 is about 805.0347818573. The cubic root of 648081 is about 86.5385796921.

It can be divided in two parts, 6480 and 81, that added together give a 8-th power (6561 = 3⁸).

The spelling of 648081 in words is "six hundred forty-eight thousand, eighty-one".