77863385 has 8 divisors (see below), whose sum is σ = 93487176. Its totient is φ = 62256640.

The previous prime is 77863381. The next prime is 77863393. The reversal of 77863385 is 58336877.

It can be written as a sum of positive squares in 4 ways, for example, as 10426441 + 67436944 = 3229^2 + 8212^2 .

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

It is not a de Polignac number, because 77863385 - 2² = 77863381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77863381) 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, 10355 + ... + 16215.

It is an arithmetic number, because the mean of its divisors is an integer number (11685897).

Almost surely, 2^77863385 is an apocalyptic number.

It is an amenable number.

77863385 is a deficient number, since it is larger than the sum of its proper divisors (15623791).

77863385 is a wasteful number, since it uses less digits than its factorization.

77863385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8523.

The product of its digits is 846720, while the sum is 47.

The square root of 77863385 is about 8824.0231754002. The cubic root of 77863385 is about 427.0162739896.

The spelling of 77863385 in words is "seventy-seven million, eight hundred sixty-three thousand, three hundred eighty-five".