405648636 has 48 divisors (see below), whose sum is σ = 981402240. Its totient is φ = 130253760.

The previous prime is 405648599. The next prime is 405648667. The reversal of 405648636 is 636846504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189291 + ... + 191421.

It is an arithmetic number, because the mean of its divisors is an integer number (20445880).

Almost surely, 2^405648636 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 405648636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (490701120).

405648636 is an abundant number, since it is smaller than the sum of its proper divisors (575753604).

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

405648636 is a wasteful number, since it uses less digits than its factorization.

405648636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714 (or 2712 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 405648636 is about 20140.7208411218. The cubic root of 405648636 is about 740.2583928417.

The spelling of 405648636 in words is "four hundred five million, six hundred forty-eight thousand, six hundred thirty-six".