77781085 has 8 divisors (see below), whose sum is σ = 93897216. Its totient is φ = 61851600.

The previous prime is 77781073. The next prime is 77781107. The reversal of 77781085 is 58018777.

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 77781085 - 2⁷ = 77780957 is a prime.

It is a Duffinian number.

It is a congruent 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, 45741 + ... + 47410.

It is an arithmetic number, because the mean of its divisors is an integer number (11737152).

Almost surely, 2^77781085 is an apocalyptic number.

It is an amenable number.

77781085 is a deficient number, since it is larger than the sum of its proper divisors (16116131).

77781085 is a wasteful number, since it uses less digits than its factorization.

77781085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93323.

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 77781085 is about 8819.3585367645. The cubic root of 77781085 is about 426.8657718051.

The spelling of 77781085 in words is "seventy-seven million, seven hundred eighty-one thousand, eighty-five".