78779049 has 4 divisors (see below), whose sum is σ = 105038736. Its totient is φ = 52519364.

The previous prime is 78779047. The next prime is 78779059. The reversal of 78779049 is 94097787.

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 a cyclic number.

It is not a de Polignac number, because 78779049 - 2¹ = 78779047 is a prime.

It is a super-2 number, since 2×78779049² = 12412277122688802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78778992 and 78779010.

It is not an unprimeable number, because it can be changed into a prime (78779047) 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 3 ways as a sum of consecutive naturals, for example, 13129839 + ... + 13129844.

It is an arithmetic number, because the mean of its divisors is an integer number (26259684).

Almost surely, 2^78779049 is an apocalyptic number.

It is an amenable number.

78779049 is a deficient number, since it is larger than the sum of its proper divisors (26259687).

78779049 is a wasteful number, since it uses less digits than its factorization.

78779049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26259686.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 78779049 is about 8875.7562494697. The cubic root of 78779049 is about 428.6836415532.

The spelling of 78779049 in words is "seventy-eight million, seven hundred seventy-nine thousand, forty-nine".