648129985 has 8 divisors (see below), whose sum is σ = 787127040. Its totient is φ = 512256624.

The previous prime is 648129973. The next prime is 648129991. The reversal of 648129985 is 589921846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 648129985 - 2⁹ = 648129473 is a prime.

It is a super-2 number, since 2×648129985² = 840144954912200450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780465 + ... + 781294.

It is an arithmetic number, because the mean of its divisors is an integer number (98390880).

Almost surely, 2^648129985 is an apocalyptic number.

It is an amenable number.

648129985 is a deficient number, since it is larger than the sum of its proper divisors (138997055).

648129985 is a wasteful number, since it uses less digits than its factorization.

648129985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561847.

The product of its digits is 1244160, while the sum is 52.

The square root of 648129985 is about 25458.3971412185. The cubic root of 648129985 is about 865.4075996772.

The spelling of 648129985 in words is "six hundred forty-eight million, one hundred twenty-nine thousand, nine hundred eighty-five".