2856421617 has 64 divisors (see below), whose sum is σ = 4679368704. Its totient is φ = 1512898560.

The previous prime is 2856421597. The next prime is 2856421657. The reversal of 2856421617 is 7161246582.

It is a happy number.

It is not a de Polignac number, because 2856421617 - 2⁸ = 2856421361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2856421657) 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 63 ways as a sum of consecutive naturals, for example, 11114353 + ... + 11114609.

It is an arithmetic number, because the mean of its divisors is an integer number (73115136).

Almost surely, 2^2856421617 is an apocalyptic number.

It is an amenable number.

2856421617 is a deficient number, since it is larger than the sum of its proper divisors (1822947087).

2856421617 is a wasteful number, since it uses less digits than its factorization.

2856421617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638.

The product of its digits is 161280, while the sum is 42.

The square root of 2856421617 is about 53445.5013728939. The cubic root of 2856421617 is about 1418.8640020123.

The spelling of 2856421617 in words is "two billion, eight hundred fifty-six million, four hundred twenty-one thousand, six hundred seventeen".