868851639 has 6 divisors (see below), whose sum is σ = 1255007936. Its totient is φ = 579234420.

The previous prime is 868851619. The next prime is 868851667. The reversal of 868851639 is 936158868.

It is not a de Polignac number, because 868851639 - 2⁸ = 868851383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868851619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48269527 + ... + 48269544.

Almost surely, 2^868851639 is an apocalyptic number.

868851639 is a deficient number, since it is larger than the sum of its proper divisors (386156297).

868851639 is a wasteful number, since it uses less digits than its factorization.

868851639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96539077 (or 96539074 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 868851639 is about 29476.2894374445. The cubic root of 868851639 is about 954.2200585401.

The spelling of 868851639 in words is "eight hundred sixty-eight million, eight hundred fifty-one thousand, six hundred thirty-nine".