77681307 has 8 divisors (see below), whose sum is σ = 112991040. Its totient is φ = 47079560.

The previous prime is 77681287. The next prime is 77681309. The reversal of 77681307 is 70318677.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77681307 - 2⁷ = 77681179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77681309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1176957 + ... + 1177022.

It is an arithmetic number, because the mean of its divisors is an integer number (14123880).

Almost surely, 2^77681307 is an apocalyptic number.

77681307 is a deficient number, since it is larger than the sum of its proper divisors (35309733).

77681307 is a wasteful number, since it uses less digits than its factorization.

77681307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353993.

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 77681307 is about 8813.6999608564. The cubic root of 77681307 is about 426.6831651199.

The spelling of 77681307 in words is "seventy-seven million, six hundred eighty-one thousand, three hundred seven".