64430819 has 2 divisors, whose sum is σ = 64430820. Its totient is φ = 64430818.

The previous prime is 64430789. The next prime is 64430831. The reversal of 64430819 is 91803446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64430819 - 2¹² = 64426723 is a prime.

It is a super-2 number, since 2×64430819² = 8302660874021522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64430869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32215409 + 32215410.

It is an arithmetic number, because the mean of its divisors is an integer number (32215410).

Almost surely, 2^64430819 is an apocalyptic number.

64430819 is a deficient number, since it is larger than the sum of its proper divisors (1).

64430819 is an equidigital number, since it uses as much as digits as its factorization.

64430819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 64430819 is about 8026.8810256537. The cubic root of 64430819 is about 400.8955331381.

The spelling of 64430819 in words is "sixty-four million, four hundred thirty thousand, eight hundred nineteen".