77700768 has 24 divisors (see below), whose sum is σ = 203964768. Its totient is φ = 25900224.

The previous prime is 77700757. The next prime is 77700769. The reversal of 77700768 is 86700777.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (77700769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404596 + ... + 404787.

It is an arithmetic number, because the mean of its divisors is an integer number (8498532).

Almost surely, 2^77700768 is an apocalyptic number.

It is an amenable number.

77700768 is an abundant number, since it is smaller than the sum of its proper divisors (126264000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77700768 is a wasteful number, since it uses less digits than its factorization.

77700768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809396 (or 809388 counting only the distinct ones).

The product of its (nonzero) digits is 115248, while the sum is 42.

The square root of 77700768 is about 8814.8039116023. The cubic root of 77700768 is about 426.7187935445.

Subtracting 77700768 from its reverse (86700777), we obtain a palindrome (9000009).

The spelling of 77700768 in words is "seventy-seven million, seven hundred thousand, seven hundred sixty-eight".