Adding to 402401664 its reverse (466104204), we get a palindrome (868505868).
It is a tau number, because it is divible by the number of its divisors (192).
It is a congruent number.
It is an unprimeable number.
Almost surely, 2402401664 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 402401664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668304000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
402401664 is a wasteful number, since it uses less digits than its factorization.
402401664 is an evil number, because the sum of its binary digits is even.
The square root of 402401664 is about 20059.9517447077. The cubic root of 402401664 is about 738.2779925241.
The spelling of 402401664 in words is "four hundred two million, four hundred one thousand, six hundred sixty-four".