76228409 has 2 divisors, whose sum is σ = 76228410. Its totient is φ = 76228408.

The previous prime is 76228393. The next prime is 76228429. The reversal of 76228409 is 90482267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67980025 + 8248384 = 8245^2 + 2872^2 .

It is an emirp because it is prime and its reverse (90482267) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76228409 - 2⁴ = 76228393 is a prime.

It is a super-3 number, since 3×76228409³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (76228429) by changing a digit.

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 as a sum of consecutive naturals, namely, 38114204 + 38114205.

It is an arithmetic number, because the mean of its divisors is an integer number (38114205).

Almost surely, 2^76228409 is an apocalyptic number.

It is an amenable number.

76228409 is a deficient number, since it is larger than the sum of its proper divisors (1).

76228409 is an equidigital number, since it uses as much as digits as its factorization.

76228409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 76228409 is about 8730.8882136928. Note that the first 3 decimals coincide. The cubic root of 76228409 is about 424.0062762362.

The spelling of 76228409 in words is "seventy-six million, two hundred twenty-eight thousand, four hundred nine".