648307861 has 8 divisors (see below), whose sum is σ = 667364544. Its totient is φ = 629432160.

The previous prime is 648307859. The next prime is 648307889. The reversal of 648307861 is 168703846.

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 648307861 - 2¹ = 648307859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648307811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37960 + ... + 52321.

It is an arithmetic number, because the mean of its divisors is an integer number (83420568).

Almost surely, 2^648307861 is an apocalyptic number.

It is an amenable number.

648307861 is a deficient number, since it is larger than the sum of its proper divisors (19056683).

648307861 is a wasteful number, since it uses less digits than its factorization.

648307861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90491.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 648307861 is about 25461.8903657996. The cubic root of 648307861 is about 865.4867613504.

The spelling of 648307861 in words is "six hundred forty-eight million, three hundred seven thousand, eight hundred sixty-one".