77331285 has 12 divisors (see below), whose sum is σ = 134040972. Its totient is φ = 41243328.

The previous prime is 77331281. The next prime is 77331301. The reversal of 77331285 is 58213377.

It can be written as a sum of positive squares in 2 ways, for example, as 44635761 + 32695524 = 6681^2 + 5718^2 .

It is not a de Polignac number, because 77331285 - 2² = 77331281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77331281) 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 11 ways as a sum of consecutive naturals, for example, 859192 + ... + 859281.

It is an arithmetic number, because the mean of its divisors is an integer number (11170081).

Almost surely, 2^77331285 is an apocalyptic number.

It is an amenable number.

77331285 is a deficient number, since it is larger than the sum of its proper divisors (56709687).

77331285 is a wasteful number, since it uses less digits than its factorization.

77331285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718484 (or 1718481 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 77331285 is about 8793.8208419321. The cubic root of 77331285 is about 426.0413402981.

The spelling of 77331285 in words is "seventy-seven million, three hundred thirty-one thousand, two hundred eighty-five".