642473914 has 4 divisors (see below), whose sum is σ = 963710874. Its totient is φ = 321236956.

The previous prime is 642473893. The next prime is 642473981. The reversal of 642473914 is 419374246.

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

It can be written as a sum of positive squares in only one way, i.e., 522899689 + 119574225 = 22867^2 + 10935^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160618477 + ... + 160618480.

Almost surely, 2^642473914 is an apocalyptic number.

642473914 is a deficient number, since it is larger than the sum of its proper divisors (321236960).

642473914 is a wasteful number, since it uses less digits than its factorization.

642473914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321236959.

The product of its digits is 145152, while the sum is 40.

The square root of 642473914 is about 25347.0691402379. The cubic root of 642473914 is about 862.8828412857.

The spelling of 642473914 in words is "six hundred forty-two million, four hundred seventy-three thousand, nine hundred fourteen".