868789645 has 4 divisors (see below), whose sum is σ = 1042547580. Its totient is φ = 695031712.

The previous prime is 868789643. The next prime is 868789681. The reversal of 868789645 is 546987868.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 423495241 + 445294404 = 20579^2 + 21102^2 .

It is a cyclic number.

It is not a de Polignac number, because 868789645 - 2¹ = 868789643 is a prime.

It is a super-3 number, since 3×868789645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868789643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86878960 + ... + 86878969.

It is an arithmetic number, because the mean of its divisors is an integer number (260636895).

Almost surely, 2^868789645 is an apocalyptic number.

It is an amenable number.

868789645 is a deficient number, since it is larger than the sum of its proper divisors (173757935).

868789645 is a wasteful number, since it uses less digits than its factorization.

868789645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173757934.

The product of its digits is 23224320, while the sum is 61.

The square root of 868789645 is about 29475.2378277089. The cubic root of 868789645 is about 954.1973629410.

The spelling of 868789645 in words is "eight hundred sixty-eight million, seven hundred eighty-nine thousand, six hundred forty-five".