69778385 has 8 divisors (see below), whose sum is σ = 84160296. Its totient is φ = 55538560.

The previous prime is 69778367. The next prime is 69778391. The reversal of 69778385 is 58387796.

It can be written as a sum of positive squares in 4 ways, for example, as 24512401 + 45265984 = 4951^2 + 6728^2 .

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

It is not a de Polignac number, because 69778385 - 2⁸ = 69778129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34436 + ... + 36405.

It is an arithmetic number, because the mean of its divisors is an integer number (10520037).

Almost surely, 2^69778385 is an apocalyptic number.

It is an amenable number.

69778385 is a deficient number, since it is larger than the sum of its proper divisors (14381911).

69778385 is a wasteful number, since it uses less digits than its factorization.

69778385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71043.

The product of its digits is 2540160, while the sum is 53.

The square root of 69778385 is about 8353.3457368889. The cubic root of 69778385 is about 411.6931470306.

The spelling of 69778385 in words is "sixty-nine million, seven hundred seventy-eight thousand, three hundred eighty-five".