47778469 has 2 divisors, whose sum is σ = 47778470. Its totient is φ = 47778468.

The previous prime is 47778431. The next prime is 47778473. The reversal of 47778469 is 96487774.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44715969 + 3062500 = 6687^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 47778469 - 2⁹ = 47777957 is a prime.

It is a super-2 number, since 2×47778469² = 4565564199967922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47778499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23889234 + 23889235.

It is an arithmetic number, because the mean of its divisors is an integer number (23889235).

Almost surely, 2^47778469 is an apocalyptic number.

It is an amenable number.

47778469 is a deficient number, since it is larger than the sum of its proper divisors (1).

47778469 is an equidigital number, since it uses as much as digits as its factorization.

47778469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 52.

The square root of 47778469 is about 6912.1971181383. The cubic root of 47778469 is about 362.8641610395.

The spelling of 47778469 in words is "forty-seven million, seven hundred seventy-eight thousand, four hundred sixty-nine".