7621643 has 2 divisors, whose sum is σ = 7621644. Its totient is φ = 7621642.

The previous prime is 7621639. The next prime is 7621673. The reversal of 7621643 is 3461267.

7621643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7621643 - 2² = 7621639 is a prime.

It is a d-powerful number, because it can be written as 7⁸ + 6 + 2³ + 1 + 6⁸ + 4³ + 3¹¹ .

It is not a weakly prime, because it can be changed into another prime (7621633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3810821 + 3810822.

It is an arithmetic number, because the mean of its divisors is an integer number (3810822).

Almost surely, 2^7621643 is an apocalyptic number.

7621643 is a deficient number, since it is larger than the sum of its proper divisors (1).

7621643 is an equidigital number, since it uses as much as digits as its factorization.

7621643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 7621643 is about 2760.7323303790. The cubic root of 7621643 is about 196.7959700604.

The spelling of 7621643 in words is "seven million, six hundred twenty-one thousand, six hundred forty-three".