665076400 has 60 divisors (see below), whose sum is σ = 1608714000. Its totient is φ = 264221440.

The previous prime is 665076359. The next prime is 665076439. The reversal of 665076400 is 4670566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54021 + ... + 65179.

It is an arithmetic number, because the mean of its divisors is an integer number (26811900).

Almost surely, 2^665076400 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 665076400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804357000).

665076400 is an abundant number, since it is smaller than the sum of its proper divisors (943637600).

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

665076400 is a wasteful number, since it uses less digits than its factorization.

665076400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11326 (or 11315 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 665076400 is about 25789.0752063737. The cubic root of 665076400 is about 872.8852987464.

The spelling of 665076400 in words is "six hundred sixty-five million, seventy-six thousand, four hundred".