77138785 has 8 divisors (see below), whose sum is σ = 92630016. Its totient is φ = 61668720.

The previous prime is 77138777. The next prime is 77138791. The reversal of 77138785 is 58783177.

It is a happy number.

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

It is not a de Polignac number, because 77138785 - 2³ = 77138777 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4320 + ... + 13150.

It is an arithmetic number, because the mean of its divisors is an integer number (11578752).

Almost surely, 2^77138785 is an apocalyptic number.

It is an amenable number.

77138785 is a deficient number, since it is larger than the sum of its proper divisors (15491231).

77138785 is a wasteful number, since it uses less digits than its factorization.

77138785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10583.

The product of its digits is 329280, while the sum is 46.

The square root of 77138785 is about 8782.8688365477. The cubic root of 77138785 is about 425.6875330663.

The spelling of 77138785 in words is "seventy-seven million, one hundred thirty-eight thousand, seven hundred eighty-five".