77136768 has 48 divisors (see below), whose sum is σ = 221972400. Its totient is φ = 25711872.

The previous prime is 77136767. The next prime is 77136791. The reversal of 77136768 is 86763177.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77136767) 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, 32328 + ... + 34631.

It is an arithmetic number, because the mean of its divisors is an integer number (4624425).

Almost surely, 2^77136768 is an apocalyptic number.

It is an amenable number.

77136768 is an abundant number, since it is smaller than the sum of its proper divisors (144835632).

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

77136768 is a wasteful number, since it uses less digits than its factorization.

77136768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66979 (or 66964 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 77136768 is about 8782.7540099903. The cubic root of 77136768 is about 425.6838227873.

The spelling of 77136768 in words is "seventy-seven million, one hundred thirty-six thousand, seven hundred sixty-eight".