64820773 has 2 divisors, whose sum is σ = 64820774. Its totient is φ = 64820772.

The previous prime is 64820753. The next prime is 64820803. The reversal of 64820773 is 37702846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64754209 + 66564 = 8047^2 + 258^2 .

It is a cyclic number.

It is not a de Polignac number, because 64820773 - 2⁵ = 64820741 is a prime.

It is a super-2 number, since 2×64820773² = 8403465224635058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64820753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32410386 + 32410387.

It is an arithmetic number, because the mean of its divisors is an integer number (32410387).

Almost surely, 2^64820773 is an apocalyptic number.

It is an amenable number.

64820773 is a deficient number, since it is larger than the sum of its proper divisors (1).

64820773 is an equidigital number, since it uses as much as digits as its factorization.

64820773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 64820773 is about 8051.1348889458. The cubic root of 64820773 is about 401.7026856202.

The spelling of 64820773 in words is "sixty-four million, eight hundred twenty thousand, seven hundred seventy-three".