64439699 has 2 divisors, whose sum is σ = 64439700. Its totient is φ = 64439698.

The previous prime is 64439693. The next prime is 64439723. The reversal of 64439699 is 99693446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64439699 - 2²⁰ = 63391123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64439693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32219849 + 32219850.

It is an arithmetic number, because the mean of its divisors is an integer number (32219850).

Almost surely, 2^64439699 is an apocalyptic number.

64439699 is a deficient number, since it is larger than the sum of its proper divisors (1).

64439699 is an equidigital number, since it uses as much as digits as its factorization.

64439699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 50.

The square root of 64439699 is about 8027.4341479703. The cubic root of 64439699 is about 400.9139497326.

The spelling of 64439699 in words is "sixty-four million, four hundred thirty-nine thousand, six hundred ninety-nine".