64729997 has 2 divisors, whose sum is σ = 64729998. Its totient is φ = 64729996.

The previous prime is 64729969. The next prime is 64730011. The reversal of 64729997 is 79992746.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35688676 + 29041321 = 5974^2 + 5389^2 .

It is a cyclic number.

It is not a de Polignac number, because 64729997 - 2¹² = 64725901 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64729927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32364998 + 32364999.

It is an arithmetic number, because the mean of its divisors is an integer number (32364999).

Almost surely, 2^64729997 is an apocalyptic number.

It is an amenable number.

64729997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64729997 is an equidigital number, since it uses as much as digits as its factorization.

64729997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 53.

The square root of 64729997 is about 8045.4954477645. The cubic root of 64729997 is about 401.5150811606.

The spelling of 64729997 in words is "sixty-four million, seven hundred twenty-nine thousand, nine hundred ninety-seven".