77315287 has 16 divisors (see below), whose sum is σ = 91886400. Its totient is φ = 65004576.

The previous prime is 77315267. The next prime is 77315297. The reversal of 77315287 is 78251377.

It is a de Polignac number, because none of the positive numbers 2^k-77315287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77315267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16053 + ... + 20305.

It is an arithmetic number, because the mean of its divisors is an integer number (5742900).

Almost surely, 2^77315287 is an apocalyptic number.

77315287 is a deficient number, since it is larger than the sum of its proper divisors (14571113).

77315287 is an equidigital number, since it uses as much as digits as its factorization.

77315287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4327 (or 4313 counting only the distinct ones).

The product of its digits is 82320, while the sum is 40.

The square root of 77315287 is about 8792.9111788986. The cubic root of 77315287 is about 426.0119590051.

The spelling of 77315287 in words is "seventy-seven million, three hundred fifteen thousand, two hundred eighty-seven".