408625220644 has 27 divisors (see below), whose sum is σ = 732209486673. Its totient is φ = 199534306272.

The previous prime is 408625220617. The next prime is 408625220683. The reversal of 408625220644 is 446022526804.

The square root of 408625220644 is 639238.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24364088100 + 384261132544 = 156090^2 + 619888^2 .

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408625220644.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 54970752 + ... + 54978184.

Almost surely, 2^408625220644 is an apocalyptic number.

408625220644 is the 639238-th square number.

It is an amenable number.

408625220644 is a deficient number, since it is larger than the sum of its proper divisors (323584266029).

408625220644 is an frugal number, since it uses more digits than its factorization.

408625220644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14956 (or 7478 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 43.

The spelling of 408625220644 in words is "four hundred eight billion, six hundred twenty-five million, two hundred twenty thousand, six hundred forty-four".