7645621 has 8 divisors (see below), whose sum is σ = 7842744. Its totient is φ = 7450560.

The previous prime is 7645607. The next prime is 7645661. The reversal of 7645621 is 1265467.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 192721 + 7452900 = 439^2 + 2730^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7645621 - 2²¹ = 5548469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7645601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9195 + ... + 9991.

It is an arithmetic number, because the mean of its divisors is an integer number (980343).

Almost surely, 2^7645621 is an apocalyptic number.

It is an amenable number.

7645621 is a deficient number, since it is larger than the sum of its proper divisors (197123).

7645621 is a wasteful number, since it uses less digits than its factorization.

7645621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

The product of its digits is 10080, while the sum is 31.

The square root of 7645621 is about 2765.0716084760. The cubic root of 7645621 is about 197.0021300671.

The spelling of 7645621 in words is "seven million, six hundred forty-five thousand, six hundred twenty-one".