82630721 has 2 divisors, whose sum is σ = 82630722. Its totient is φ = 82630720.

The previous prime is 82630699. The next prime is 82630729. The reversal of 82630721 is 12703628.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78570496 + 4060225 = 8864^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 82630721 - 2¹⁰ = 82629697 is a prime.

It is not a weakly prime, because it can be changed into another prime (82630729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41315360 + 41315361.

It is an arithmetic number, because the mean of its divisors is an integer number (41315361).

Almost surely, 2^82630721 is an apocalyptic number.

It is an amenable number.

82630721 is a deficient number, since it is larger than the sum of its proper divisors (1).

82630721 is an equidigital number, since it uses as much as digits as its factorization.

82630721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 82630721 is about 9090.1441682737. The cubic root of 82630721 is about 435.5591892567.

The spelling of 82630721 in words is "eighty-two million, six hundred thirty thousand, seven hundred twenty-one".