77169985 has 8 divisors (see below), whose sum is σ = 92903616. Its totient is φ = 61536240.

The previous prime is 77169977. The next prime is 77170003. The reversal of 77169985 is 58996177.

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 77169985 - 2³ = 77169977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23259 + ... + 26368.

It is an arithmetic number, because the mean of its divisors is an integer number (11612952).

Almost surely, 2^77169985 is an apocalyptic number.

It is an amenable number.

77169985 is a deficient number, since it is larger than the sum of its proper divisors (15733631).

77169985 is a wasteful number, since it uses less digits than its factorization.

77169985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49943.

The product of its digits is 952560, while the sum is 52.

The square root of 77169985 is about 8784.6448419956. The cubic root of 77169985 is about 425.7449173459.

It can be divided in two parts, 771 and 69985, that added together give a square (70756 = 266²).

The spelling of 77169985 in words is "seventy-seven million, one hundred sixty-nine thousand, nine hundred eighty-five".