76779985 has 4 divisors (see below), whose sum is σ = 92135988. Its totient is φ = 61423984.

The previous prime is 76779979. The next prime is 76780001. The reversal of 76779985 is 58997767.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58997767 = 107 ⋅551381.

It can be written as a sum of positive squares in 2 ways, for example, as 48986001 + 27793984 = 6999^2 + 5272^2 .

It is a cyclic number.

It is not a de Polignac number, because 76779985 - 2³ = 76779977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7677994 + ... + 7678003.

It is an arithmetic number, because the mean of its divisors is an integer number (23033997).

Almost surely, 2^76779985 is an apocalyptic number.

It is an amenable number.

76779985 is a deficient number, since it is larger than the sum of its proper divisors (15356003).

76779985 is a wasteful number, since it uses less digits than its factorization.

76779985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15356002.

The product of its digits is 6667920, while the sum is 58.

The square root of 76779985 is about 8762.4189011939. The cubic root of 76779985 is about 425.0264989244.

The spelling of 76779985 in words is "seventy-six million, seven hundred seventy-nine thousand, nine hundred eighty-five".