64446820 has 24 divisors (see below), whose sum is σ = 135838584. Its totient is φ = 25683456.

The previous prime is 64446817. The next prime is 64446827. The reversal of 64446820 is 2864446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3481956 + 60964864 = 1866^2 + 7808^2 .

It is a super-2 number, since 2×64446820² = 8306785216224800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64446827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277 + ... + 11356.

It is an arithmetic number, because the mean of its divisors is an integer number (5659941).

Almost surely, 2^64446820 is an apocalyptic number.

It is an amenable number.

64446820 is an abundant number, since it is smaller than the sum of its proper divisors (71391764).

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

64446820 is a wasteful number, since it uses less digits than its factorization.

64446820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11919 (or 11917 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 64446820 is about 8027.8776771946. The cubic root of 64446820 is about 400.9287170428.

The spelling of 64446820 in words is "sixty-four million, four hundred forty-six thousand, eight hundred twenty".