76778419 has 2 divisors, whose sum is σ = 76778420. Its totient is φ = 76778418.

The previous prime is 76778389. The next prime is 76778459. The reversal of 76778419 is 91487767.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76778419 - 2⁹ = 76777907 is a prime.

It is a super-2 number, since 2×76778419² = 11789851248279122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76778459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38389209 + 38389210.

It is an arithmetic number, because the mean of its divisors is an integer number (38389210).

Almost surely, 2^76778419 is an apocalyptic number.

76778419 is a deficient number, since it is larger than the sum of its proper divisors (1).

76778419 is an equidigital number, since it uses as much as digits as its factorization.

76778419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 49.

The square root of 76778419 is about 8762.3295418513. The cubic root of 76778419 is about 425.0236092998.

The spelling of 76778419 in words is "seventy-six million, seven hundred seventy-eight thousand, four hundred nineteen".