7028802721 has 2 divisors, whose sum is σ = 7028802722. Its totient is φ = 7028802720.

The previous prime is 7028802667. The next prime is 7028802743. The reversal of 7028802721 is 1272088207.

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., 6958896400 + 69906321 = 83420^2 + 8361^2 .

It is a cyclic number.

It is not a de Polignac number, because 7028802721 - 2¹³ = 7028794529 is a prime.

It is not a weakly prime, because it can be changed into another prime (7028892721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3514401360 + 3514401361.

It is an arithmetic number, because the mean of its divisors is an integer number (3514401361).

Almost surely, 2^7028802721 is an apocalyptic number.

It is an amenable number.

7028802721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7028802721 is an equidigital number, since it uses as much as digits as its factorization.

7028802721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 7028802721 is about 83837.9551336982. The cubic root of 7028802721 is about 1915.5512887643.

The spelling of 7028802721 in words is "seven billion, twenty-eight million, eight hundred two thousand, seven hundred twenty-one".