8728572421 has 2 divisors, whose sum is σ = 8728572422. Its totient is φ = 8728572420.

The previous prime is 8728572397. The next prime is 8728572481. The reversal of 8728572421 is 1242758278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8579390625 + 149181796 = 92625^2 + 12214^2 .

It is a cyclic number.

It is not a de Polignac number, because 8728572421 - 2⁵ = 8728572389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8728572481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4364286210 + 4364286211.

It is an arithmetic number, because the mean of its divisors is an integer number (4364286211).

Almost surely, 2^8728572421 is an apocalyptic number.

It is an amenable number.

8728572421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8728572421 is an equidigital number, since it uses as much as digits as its factorization.

8728572421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 501760, while the sum is 46.

The square root of 8728572421 is about 93426.8292355039. The cubic root of 8728572421 is about 2058.9591956119.

The spelling of 8728572421 in words is "eight billion, seven hundred twenty-eight million, five hundred seventy-two thousand, four hundred twenty-one".