64507273 has 2 divisors, whose sum is σ = 64507274. Its totient is φ = 64507272.

The previous prime is 64507241. The next prime is 64507291. The reversal of 64507273 is 37270546.

It is a happy number.

64507273 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63872064 + 635209 = 7992^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 64507273 - 2⁵ = 64507241 is a prime.

It is a super-2 number, since 2×64507273² = 8322376539793058, which contains 22 as substring.

It is equal to p_3813289 and since 64507273 and 3813289 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64507873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32253636 + 32253637.

It is an arithmetic number, because the mean of its divisors is an integer number (32253637).

Almost surely, 2^64507273 is an apocalyptic number.

It is an amenable number.

64507273 is a deficient number, since it is larger than the sum of its proper divisors (1).

64507273 is an equidigital number, since it uses as much as digits as its factorization.

64507273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 64507273 is about 8031.6419865430. The cubic root of 64507273 is about 401.0540388158.

The spelling of 64507273 in words is "sixty-four million, five hundred seven thousand, two hundred seventy-three".