77878601 has 8 divisors (see below), whose sum is σ = 80757000. Its totient is φ = 75013120.

The previous prime is 77878597. The next prime is 77878627. The reversal of 77878601 is 10687877.

It can be written as a sum of positive squares in 4 ways, for example, as 1752976 + 76125625 = 1324^2 + 8725^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 77878601 - 2² = 77878597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77878301) by changing a digit.

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, 10031 + ... + 16011.

It is an arithmetic number, because the mean of its divisors is an integer number (10094625).

Almost surely, 2^77878601 is an apocalyptic number.

It is an amenable number.

77878601 is a deficient number, since it is larger than the sum of its proper divisors (2878399).

77878601 is a wasteful number, since it uses less digits than its factorization.

77878601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459.

The product of its (nonzero) digits is 131712, while the sum is 44.

The square root of 77878601 is about 8824.8853250340. The cubic root of 77878601 is about 427.0440879033.

The spelling of 77878601 in words is "seventy-seven million, eight hundred seventy-eight thousand, six hundred one".