64820273 has 4 divisors (see below), whose sum is σ = 74080320. Its totient is φ = 55560228.

The previous prime is 64820251. The next prime is 64820293. The reversal of 64820273 is 37202846.

64820273 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37202846 = 2 ⋅18601423.

It is a cyclic number.

It is not a de Polignac number, because 64820273 - 2⁶ = 64820209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64820293) 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 in 3 ways as a sum of consecutive naturals, for example, 4630013 + ... + 4630026.

It is an arithmetic number, because the mean of its divisors is an integer number (18520080).

Almost surely, 2^64820273 is an apocalyptic number.

It is an amenable number.

64820273 is a deficient number, since it is larger than the sum of its proper divisors (9260047).

64820273 is an equidigital number, since it uses as much as digits as its factorization.

64820273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9260046.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 64820273 is about 8051.1038373629. The cubic root of 64820273 is about 401.7016527627.

The spelling of 64820273 in words is "sixty-four million, eight hundred twenty thousand, two hundred seventy-three".