64815743 has 2 divisors, whose sum is σ = 64815744. Its totient is φ = 64815742.

The previous prime is 64815731. The next prime is 64815757. The reversal of 64815743 is 34751846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64815743 - 2¹² = 64811647 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 64815697 and 64815706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64815703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32407871 + 32407872.

It is an arithmetic number, because the mean of its divisors is an integer number (32407872).

Almost surely, 2^64815743 is an apocalyptic number.

64815743 is a deficient number, since it is larger than the sum of its proper divisors (1).

64815743 is an equidigital number, since it uses as much as digits as its factorization.

64815743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 64815743 is about 8050.8225045644. The cubic root of 64815743 is about 401.6922948320.

The spelling of 64815743 in words is "sixty-four million, eight hundred fifteen thousand, seven hundred forty-three".