78805677 has 4 divisors (see below), whose sum is σ = 105074240. Its totient is φ = 52537116.

The previous prime is 78805667. The next prime is 78805703. The reversal of 78805677 is 77650887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78805677 - 2¹⁰ = 78804653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78805637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13134277 + ... + 13134282.

It is an arithmetic number, because the mean of its divisors is an integer number (26268560).

Almost surely, 2^78805677 is an apocalyptic number.

It is an amenable number.

78805677 is a deficient number, since it is larger than the sum of its proper divisors (26268563).

78805677 is a wasteful number, since it uses less digits than its factorization.

78805677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26268562.

The product of its (nonzero) digits is 658560, while the sum is 48.

The square root of 78805677 is about 8877.2561639281. The cubic root of 78805677 is about 428.7319357053.

The spelling of 78805677 in words is "seventy-eight million, eight hundred five thousand, six hundred seventy-seven".