64445340 has 48 divisors (see below), whose sum is σ = 189947520. Its totient is φ = 16280640.

The previous prime is 64445327. The next prime is 64445371. The reversal of 64445340 is 4354446.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64445298 and 64445307.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27126 + ... + 29405.

It is an arithmetic number, because the mean of its divisors is an integer number (3957240).

Almost surely, 2^64445340 is an apocalyptic number.

64445340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64445340 is an abundant number, since it is smaller than the sum of its proper divisors (125502180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64445340 is a wasteful number, since it uses less digits than its factorization.

64445340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56562 (or 56560 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

The square root of 64445340 is about 8027.7854978817. The cubic root of 64445340 is about 400.9256479540.

Adding to 64445340 its reverse (4354446), we get a palindrome (68799786).

The spelling of 64445340 in words is "sixty-four million, four hundred forty-five thousand, three hundred forty".