77439385 has 8 divisors (see below), whose sum is σ = 93259656. Its totient is φ = 61729920.

The previous prime is 77439361. The next prime is 77439391. The reversal of 77439385 is 58393477.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33918976 + 43520409 = 5824^2 + 6597^2 .

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

It is not a de Polignac number, because 77439385 - 2⁵ = 77439353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 26154 + ... + 28963.

It is an arithmetic number, because the mean of its divisors is an integer number (11657457).

Almost surely, 2^77439385 is an apocalyptic number.

It is an amenable number.

77439385 is a deficient number, since it is larger than the sum of its proper divisors (15820271).

77439385 is a wasteful number, since it uses less digits than its factorization.

77439385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55403.

The product of its digits is 635040, while the sum is 46.

The square root of 77439385 is about 8799.9650567488. The cubic root of 77439385 is about 426.2397663542.

The spelling of 77439385 in words is "seventy-seven million, four hundred thirty-nine thousand, three hundred eighty-five".