77891307 has 8 divisors (see below), whose sum is σ = 111843984. Its totient is φ = 47933088.

The previous prime is 77891273. The next prime is 77891309. The reversal of 77891307 is 70319877.

It is a happy number.

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

It is not a de Polignac number, because 77891307 - 2⁶ = 77891243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77891309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 998568 + ... + 998645.

It is an arithmetic number, because the mean of its divisors is an integer number (13980498).

Almost surely, 2^77891307 is an apocalyptic number.

77891307 is a deficient number, since it is larger than the sum of its proper divisors (33952677).

77891307 is a wasteful number, since it uses less digits than its factorization.

77891307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997229.

The product of its (nonzero) digits is 74088, while the sum is 42.

The square root of 77891307 is about 8825.6051917135. The cubic root of 77891307 is about 427.0673109156.

The spelling of 77891307 in words is "seventy-seven million, eight hundred ninety-one thousand, three hundred seven".