405661064 has 8 divisors (see below), whose sum is σ = 760614510. Its totient is φ = 202830528.

The previous prime is 405661063. The next prime is 405661111. The reversal of 405661064 is 460166504.

It can be written as a sum of positive squares in only one way, i.e., 292068100 + 113592964 = 17090^2 + 10658^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×405661064² = 329121797691224192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 405661064.

It is not an unprimeable number, because it can be changed into a prime (405661063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25353809 + ... + 25353824.

Almost surely, 2^405661064 is an apocalyptic number.

It is an amenable number.

405661064 is a deficient number, since it is larger than the sum of its proper divisors (354953446).

405661064 is a wasteful number, since it uses less digits than its factorization.

405661064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50707639 (or 50707635 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 405661064 is about 20141.0293679345. The cubic root of 405661064 is about 740.2659526168.

The spelling of 405661064 in words is "four hundred five million, six hundred sixty-one thousand, sixty-four".