406662644 has 12 divisors (see below), whose sum is σ = 753522084. Its totient is φ = 191370624.

The previous prime is 406662631. The next prime is 406662647. The reversal of 406662644 is 446266604.

It can be written as a sum of positive squares in 2 ways, for example, as 298252900 + 108409744 = 17270^2 + 10412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 406662598 and 406662607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406662647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2990099 + ... + 2990234.

It is an arithmetic number, because the mean of its divisors is an integer number (62793507).

Almost surely, 2^406662644 is an apocalyptic number.

It is an amenable number.

406662644 is a deficient number, since it is larger than the sum of its proper divisors (346859440).

406662644 is a wasteful number, since it uses less digits than its factorization.

406662644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5980354 (or 5980352 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 406662644 is about 20165.8782104822. The cubic root of 406662644 is about 740.8746924992.

The spelling of 406662644 in words is "four hundred six million, six hundred sixty-two thousand, six hundred forty-four".