642238848 has 64 divisors (see below), whose sum is σ = 1895506800. Its totient is φ = 214078464.

The previous prime is 642238829. The next prime is 642238853. The reversal of 642238848 is 848832246.

It is a tau number, because it is divible by the number of its divisors (64).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89461 + ... + 96372.

Almost surely, 2^642238848 is an apocalyptic number.

It is an amenable number.

642238848 is an abundant number, since it is smaller than the sum of its proper divisors (1253267952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642238848 is a wasteful number, since it uses less digits than its factorization.

642238848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185856 (or 185838 counting only the distinct ones).

The product of its digits is 589824, while the sum is 45.

The square root of 642238848 is about 25342.4317696625. The cubic root of 642238848 is about 862.7775923119. Note that the first 3 decimals are identical.

The spelling of 642238848 in words is "six hundred forty-two million, two hundred thirty-eight thousand, eight hundred forty-eight".