69776389 has 2 divisors, whose sum is σ = 69776390. Its totient is φ = 69776388.

The previous prime is 69776387. The next prime is 69776479. The reversal of 69776389 is 98367796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67650625 + 2125764 = 8225^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 69776389 - 2¹ = 69776387 is a prime.

Together with 69776387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69776387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34888194 + 34888195.

It is an arithmetic number, because the mean of its divisors is an integer number (34888195).

Almost surely, 2^69776389 is an apocalyptic number.

It is an amenable number.

69776389 is a deficient number, since it is larger than the sum of its proper divisors (1).

69776389 is an equidigital number, since it uses as much as digits as its factorization.

69776389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 55.

The square root of 69776389 is about 8353.2262629477. The cubic root of 69776389 is about 411.6892215201.

It can be divided in two parts, 6977 and 6389, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 69776389 in words is "sixty-nine million, seven hundred seventy-six thousand, three hundred eighty-nine".