64644469 has 2 divisors, whose sum is σ = 64644470. Its totient is φ = 64644468.

The previous prime is 64644457. The next prime is 64644473. The reversal of 64644469 is 96444646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 14730244 = 7065^2 + 3838^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644469 - 2¹³ = 64636277 is a prime.

It is a super-2 number, since 2×64644469² = 8357814744583922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64644449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322234 + 32322235.

It is an arithmetic number, because the mean of its divisors is an integer number (32322235).

Almost surely, 2^64644469 is an apocalyptic number.

It is an amenable number.

64644469 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644469 is an equidigital number, since it uses as much as digits as its factorization.

64644469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 43.

The square root of 64644469 is about 8040.1784184183. The cubic root of 64644469 is about 401.3381620636.

The spelling of 64644469 in words is "sixty-four million, six hundred forty-four thousand, four hundred sixty-nine".