642813406 has 4 divisors (see below), whose sum is σ = 964220112. Its totient is φ = 321406702.

The previous prime is 642813403. The next prime is 642813419. The reversal of 642813406 is 604318246.

642813406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642813403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160703350 + ... + 160703353.

It is an arithmetic number, because the mean of its divisors is an integer number (241055028).

Almost surely, 2^642813406 is an apocalyptic number.

642813406 is a deficient number, since it is larger than the sum of its proper divisors (321406706).

642813406 is a wasteful number, since it uses less digits than its factorization.

642813406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321406705.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 642813406 is about 25353.7651247305. The cubic root of 642813406 is about 863.0348008865.

The spelling of 642813406 in words is "six hundred forty-two million, eight hundred thirteen thousand, four hundred six".