77843968 has 20 divisors (see below), whose sum is σ = 155536920. Its totient is φ = 38921728.

The previous prime is 77843963. The next prime is 77843971. The reversal of 77843968 is 86934877.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77843963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75508 + ... + 76531.

It is an arithmetic number, because the mean of its divisors is an integer number (7776846).

Almost surely, 2^77843968 is an apocalyptic number.

It is an amenable number.

77843968 is a deficient number, since it is larger than the sum of its proper divisors (77692952).

77843968 is an equidigital number, since it uses as much as digits as its factorization.

77843968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152057 (or 152041 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The square root of 77843968 is about 8822.9228717019. The cubic root of 77843968 is about 426.9807756429.

Subtracting 77843968 from its reverse (86934877), we obtain a palindrome (9090909).

The spelling of 77843968 in words is "seventy-seven million, eight hundred forty-three thousand, nine hundred sixty-eight".