409721064 has 32 divisors (see below), whose sum is σ = 1024804320. Its totient is φ = 136506816.

The previous prime is 409721047. The next prime is 409721089. The reversal of 409721064 is 460127904.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82722 + ... + 87534.

It is an arithmetic number, because the mean of its divisors is an integer number (32025135).

Almost surely, 2^409721064 is an apocalyptic number.

It is an amenable number.

409721064 is an abundant number, since it is smaller than the sum of its proper divisors (615083256).

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

409721064 is a wasteful number, since it uses less digits than its factorization.

409721064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8369 (or 8365 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 409721064 is about 20241.5677258457. The cubic root of 409721064 is about 742.7273740496.

Adding to 409721064 its reverse (460127904), we get a palindrome (869848968).

The spelling of 409721064 in words is "four hundred nine million, seven hundred twenty-one thousand, sixty-four".