768857636 has 6 divisors (see below), whose sum is σ = 1345500870. Its totient is φ = 384428816.

The previous prime is 768857633. The next prime is 768857647. The reversal of 768857636 is 636758867.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 413308900 + 355548736 = 20330^2 + 18856^2 .

It is a super-2 number, since 2×768857636² = 1182284128871016992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (768857633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96107201 + ... + 96107208.

It is an arithmetic number, because the mean of its divisors is an integer number (224250145).

Almost surely, 2^768857636 is an apocalyptic number.

It is an amenable number.

768857636 is a deficient number, since it is larger than the sum of its proper divisors (576643234).

768857636 is a wasteful number, since it uses less digits than its factorization.

768857636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192214413 (or 192214411 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 56.

The square root of 768857636 is about 27728.2822403408. The cubic root of 768857636 is about 916.1121520034.

The spelling of 768857636 in words is "seven hundred sixty-eight million, eight hundred fifty-seven thousand, six hundred thirty-six".