64469389 has 4 divisors (see below), whose sum is σ = 68261724. Its totient is φ = 60677056.

The previous prime is 64469387. The next prime is 64469393. The reversal of 64469389 is 98396446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98396446 = 2 ⋅49198223.

It can be written as a sum of positive squares in 2 ways, for example, as 18636489 + 45832900 = 4317^2 + 6770^2 .

It is a cyclic number.

It is not a de Polignac number, because 64469389 - 2¹ = 64469387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64469387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1896142 + ... + 1896175.

It is an arithmetic number, because the mean of its divisors is an integer number (17065431).

Almost surely, 2^64469389 is an apocalyptic number.

It is an amenable number.

64469389 is a deficient number, since it is larger than the sum of its proper divisors (3792335).

64469389 is a wasteful number, since it uses less digits than its factorization.

64469389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792334.

The product of its digits is 1119744, while the sum is 49.

The square root of 64469389 is about 8029.2832183203. The cubic root of 64469389 is about 400.9755127532.

The spelling of 64469389 in words is "sixty-four million, four hundred sixty-nine thousand, three hundred eighty-nine".