4284720638 has 32 divisors (see below), whose sum is σ = 7275578112. Its totient is φ = 1875484800.

The previous prime is 4284720631. The next prime is 4284720641. The reversal of 4284720638 is 8360274824.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4284720631) 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 15 ways as a sum of consecutive naturals, for example, 35270 + ... + 99062.

It is an arithmetic number, because the mean of its divisors is an integer number (227361816).

Almost surely, 2^4284720638 is an apocalyptic number.

4284720638 is a deficient number, since it is larger than the sum of its proper divisors (2990857474).

4284720638 is a wasteful number, since it uses less digits than its factorization.

4284720638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63920.

The product of its (nonzero) digits is 516096, while the sum is 44.

The square root of 4284720638 is about 65457.7775210861. Note that the first 3 decimals coincide. The cubic root of 4284720638 is about 1624.2049776356.

The spelling of 4284720638 in words is "four billion, two hundred eighty-four million, seven hundred twenty thousand, six hundred thirty-eight".