642244406 has 8 divisors (see below), whose sum is σ = 963475560. Its totient is φ = 321085888.

The previous prime is 642244397. The next prime is 642244429. The reversal of 642244406 is 604442246.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19910 + ... + 40998.

It is an arithmetic number, because the mean of its divisors is an integer number (120434445).

Almost surely, 2^642244406 is an apocalyptic number.

642244406 is a deficient number, since it is larger than the sum of its proper divisors (321231154).

642244406 is a wasteful number, since it uses less digits than its factorization.

642244406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36318.

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 642244406 is about 25342.5414274102. The cubic root of 642244406 is about 862.7800811596.

The spelling of 642244406 in words is "six hundred forty-two million, two hundred forty-four thousand, four hundred six".