64505723 has 2 divisors, whose sum is σ = 64505724. Its totient is φ = 64505722.

The previous prime is 64505671. The next prime is 64505729. The reversal of 64505723 is 32750546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64505723 - 2⁶ = 64505659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64505723.

It is not a weakly prime, because it can be changed into another prime (64505729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32252861 + 32252862.

It is an arithmetic number, because the mean of its divisors is an integer number (32252862).

Almost surely, 2^64505723 is an apocalyptic number.

64505723 is a deficient number, since it is larger than the sum of its proper divisors (1).

64505723 is an equidigital number, since it uses as much as digits as its factorization.

64505723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 64505723 is about 8031.5454926185. The cubic root of 64505723 is about 401.0508265747.

The spelling of 64505723 in words is "sixty-four million, five hundred five thousand, seven hundred twenty-three".