648000081 has 28 divisors (see below), whose sum is σ = 986130832. Its totient is φ = 425520216.

The previous prime is 648000079. The next prime is 648000083. The reversal of 648000081 is 180000846.

It is an interprime number because it is at equal distance from previous prime (648000079) and next prime (648000083).

It is not a de Polignac number, because 648000081 - 2¹ = 648000079 is a prime.

It is a super-2 number, since 2×648000081² = 839808209952013122, 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 not an unprimeable number, because it can be changed into a prime (648000083) 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, 42210 + ... + 55476.

Almost surely, 2^648000081 is an apocalyptic number.

It is an amenable number.

648000081 is a deficient number, since it is larger than the sum of its proper divisors (338130751).

648000081 is an equidigital number, since it uses as much as digits as its factorization.

648000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13352 (or 13337 counting only the distinct ones).

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

The square root of 648000081 is about 25455.8457137059. The cubic root of 648000081 is about 865.3497782407.

The spelling of 648000081 in words is "six hundred forty-eight million, eighty-one", and thus it is an aban number.