7640621 has 2 divisors, whose sum is σ = 7640622. Its totient is φ = 7640620.

The previous prime is 7640617. The next prime is 7640681. The reversal of 7640621 is 1260467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3880900 + 3759721 = 1970^2 + 1939^2 .

It is a cyclic number.

It is not a de Polignac number, because 7640621 - 2² = 7640617 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7640681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3820310 + 3820311.

It is an arithmetic number, because the mean of its divisors is an integer number (3820311).

Almost surely, 2^7640621 is an apocalyptic number.

It is an amenable number.

7640621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7640621 is an equidigital number, since it uses as much as digits as its factorization.

7640621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 7640621 is about 2764.1673248919. The cubic root of 7640621 is about 196.9591762660.

The spelling of 7640621 in words is "seven million, six hundred forty thousand, six hundred twenty-one".