864487897 has 24 divisors (see below), whose sum is σ = 1126167360. Its totient is φ = 647974080.

The previous prime is 864487891. The next prime is 864487901. The reversal of 864487897 is 798784468.

864487897 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 864487897 - 2⁷ = 864487769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864487891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3247 + ... + 41707.

It is an arithmetic number, because the mean of its divisors is an integer number (46923640).

Almost surely, 2^864487897 is an apocalyptic number.

It is an amenable number.

864487897 is a deficient number, since it is larger than the sum of its proper divisors (261679463).

864487897 is a wasteful number, since it uses less digits than its factorization.

864487897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38513 (or 38500 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 61.

The square root of 864487897 is about 29402.1750385920. The cubic root of 864487897 is about 952.6198771238.

The spelling of 864487897 in words is "eight hundred sixty-four million, four hundred eighty-seven thousand, eight hundred ninety-seven".