77331985 has 8 divisors (see below), whose sum is σ = 92849256. Its totient is φ = 61831680.

The previous prime is 77331983. The next prime is 77332007. The reversal of 77331985 is 58913377.

It can be written as a sum of positive squares in 4 ways, for example, as 25160256 + 52171729 = 5016^2 + 7223^2 .

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

It is not a de Polignac number, because 77331985 - 2¹ = 77331983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77331983) 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, 10375 + ... + 16195.

It is an arithmetic number, because the mean of its divisors is an integer number (11606157).

Almost surely, 2^77331985 is an apocalyptic number.

It is an amenable number.

77331985 is a deficient number, since it is larger than the sum of its proper divisors (15517271).

77331985 is a wasteful number, since it uses less digits than its factorization.

77331985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8483.

The product of its digits is 158760, while the sum is 43.

The square root of 77331985 is about 8793.8606425165. The cubic root of 77331985 is about 426.0426257978.

The spelling of 77331985 in words is "seventy-seven million, three hundred thirty-one thousand, nine hundred eighty-five".