7626721 has 2 divisors, whose sum is σ = 7626722. Its totient is φ = 7626720.

The previous prime is 7626719. The next prime is 7626743. The reversal of 7626721 is 1276267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7623121 + 3600 = 2761^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 7626721 - 2¹ = 7626719 is a prime.

Together with 7626719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7626701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3813360 + 3813361.

It is an arithmetic number, because the mean of its divisors is an integer number (3813361).

Almost surely, 2^7626721 is an apocalyptic number.

It is an amenable number.

7626721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7626721 is an equidigital number, since it uses as much as digits as its factorization.

7626721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 7626721 is about 2761.6518607529. The cubic root of 7626721 is about 196.8396661541.

The spelling of 7626721 in words is "seven million, six hundred twenty-six thousand, seven hundred twenty-one".