478720813 has 2 divisors, whose sum is σ = 478720814. Its totient is φ = 478720812.

The previous prime is 478720807. The next prime is 478720841. The reversal of 478720813 is 318027874.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458045604 + 20675209 = 21402^2 + 4547^2 .

It is a cyclic number.

It is not a de Polignac number, because 478720813 - 2²¹ = 476623661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478720883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239360406 + 239360407.

It is an arithmetic number, because the mean of its divisors is an integer number (239360407).

Almost surely, 2^478720813 is an apocalyptic number.

It is an amenable number.

478720813 is a deficient number, since it is larger than the sum of its proper divisors (1).

478720813 is an equidigital number, since it uses as much as digits as its factorization.

478720813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 478720813 is about 21879.6895087659. The cubic root of 478720813 is about 782.2773750415.

It can be divided in two parts, 4787 and 20813, that added together give a square (25600 = 160²).

The spelling of 478720813 in words is "four hundred seventy-eight million, seven hundred twenty thousand, eight hundred thirteen".