4284720639 has 8 divisors (see below), whose sum is σ = 6347734320. Its totient is φ = 2856480408.

The previous prime is 4284720631. The next prime is 4284720641. The reversal of 4284720639 is 9360274824.

4284720639 is a `hidden beast` number, since 4 + 2 + 8 + 4 + 7 + 2 + 0 + 639 = 666.

It is not a de Polignac number, because 4284720639 - 2³ = 4284720631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4284720594 and 4284720603.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79346652 + ... + 79346705.

It is an arithmetic number, because the mean of its divisors is an integer number (793466790).

Almost surely, 2^4284720639 is an apocalyptic number.

4284720639 is a deficient number, since it is larger than the sum of its proper divisors (2063013681).

4284720639 is a wasteful number, since it uses less digits than its factorization.

4284720639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158693366 (or 158693360 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 4284720639 is about 65457.7775287246. Note that the first 3 decimals coincide. The cubic root of 4284720639 is about 1624.2049777620.

The spelling of 4284720639 in words is "four billion, two hundred eighty-four million, seven hundred twenty thousand, six hundred thirty-nine".