64780427 has 2 divisors, whose sum is σ = 64780428. Its totient is φ = 64780426.

The previous prime is 64780399. The next prime is 64780433. The reversal of 64780427 is 72408746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64780427 - 2¹⁴ = 64764043 is a prime.

It is not a weakly prime, because it can be changed into another prime (64780447) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32390213 + 32390214.

It is an arithmetic number, because the mean of its divisors is an integer number (32390214).

Almost surely, 2^64780427 is an apocalyptic number.

64780427 is a deficient number, since it is larger than the sum of its proper divisors (1).

64780427 is an equidigital number, since it uses as much as digits as its factorization.

64780427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 64780427 is about 8048.6288894445. The cubic root of 64780427 is about 401.6193252018.

The spelling of 64780427 in words is "sixty-four million, seven hundred eighty thousand, four hundred twenty-seven".