406644620402 has 8 divisors (see below), whose sum is σ = 626452523436. Its totient is φ = 197827112592.

The previous prime is 406644620383. The next prime is 406644620407. The reversal of 406644620402 is 204026446604.

It can be written as a sum of positive squares in 2 ways, for example, as 405793206361 + 851414041 = 637019^2 + 29179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (406644620407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2747598713 + ... + 2747598860.

Almost surely, 2^406644620402 is an apocalyptic number.

406644620402 is a deficient number, since it is larger than the sum of its proper divisors (219807903034).

406644620402 is a wasteful number, since it uses less digits than its factorization.

406644620402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5495197612.

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 406644620402 in words is "four hundred six billion, six hundred forty-four million, six hundred twenty thousand, four hundred two".