8720458639 has 2 divisors, whose sum is σ = 8720458640. Its totient is φ = 8720458638.

The previous prime is 8720458619. The next prime is 8720458651. The reversal of 8720458639 is 9368540278.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8720458639 - 2⁷ = 8720458511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8720458619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4360229319 + 4360229320.

It is an arithmetic number, because the mean of its divisors is an integer number (4360229320).

Almost surely, 2^8720458639 is an apocalyptic number.

8720458639 is a deficient number, since it is larger than the sum of its proper divisors (1).

8720458639 is an equidigital number, since it uses as much as digits as its factorization.

8720458639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The square root of 8720458639 is about 93383.3959491729. The cubic root of 8720458639 is about 2058.3210185097.

The spelling of 8720458639 in words is "eight billion, seven hundred twenty million, four hundred fifty-eight thousand, six hundred thirty-nine".