400066064 has 10 divisors (see below), whose sum is σ = 775128030. Its totient is φ = 200033024.

The previous prime is 400066039. The next prime is 400066081. The reversal of 400066064 is 460660004.

It can be written as a sum of positive squares in only one way, i.e., 278890000 + 121176064 = 16700^2 + 11008^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12502049 + ... + 12502080.

It is an arithmetic number, because the mean of its divisors is an integer number (77512803).

Almost surely, 2^400066064 is an apocalyptic number.

It is an amenable number.

400066064 is a deficient number, since it is larger than the sum of its proper divisors (375061966).

400066064 is a wasteful number, since it uses less digits than its factorization.

400066064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25004137 (or 25004131 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 400066064 is about 20001.6515318111. The cubic root of 400066064 is about 736.8468611379.

The spelling of 400066064 in words is "four hundred million, sixty-six thousand, sixty-four".